Attempting to install silently using the below string fails with exit code 1. Enabling the logging parameter gives some indication as to why but it's still not clear:

Code:
spybotsd-2.8.68.0.exe /silent /NOCLOSEAPPLICATIONS /NORESTARTAPPLICATIONS /NORESTART /SP- /SUPPRESSMSGBOXES /LOG="log.log"
Code:
2021-05-20 19:40:40.736   Log opened. (Time zone: UTC+01:00)
2021-05-20 19:40:40.736   Setup version: Inno Setup version 6.0.2 (u)
2021-05-20 19:40:40.736   Original Setup EXE: C:\Users\WDAGUtilityAccount\Desktop\spybotsd-2.8.68.0.exe
2021-05-20 19:40:40.736   Setup command line: /SL5="$50AB4,68440474,806912,C:\Users\WDAGUtilityAccount\Desktop\spybotsd-2.8.68.0.exe" /silent /NOCLOSEAPPLICATIONS /NORESTARTAPPLICATIONS /NORESTART /SP- /SUPPRESSMSGBOXES /LOG="log.log"
2021-05-20 19:40:40.736   Windows version: 10.0.19041  (NT platform: Yes)
2021-05-20 19:40:40.736   64-bit Windows: Yes
2021-05-20 19:40:40.736   Processor architecture: x64
2021-05-20 19:40:40.736   User privileges: Administrative
2021-05-20 19:40:40.751   Administrative install mode: Yes
2021-05-20 19:40:40.751   Install mode root key: HKEY_LOCAL_MACHINE
2021-05-20 19:40:40.751   64-bit install mode: No
2021-05-20 19:40:40.751   Created temporary directory: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: PeekMessageA
2021-05-20 19:40:40.751   DLL name: setup:user32.dll
2021-05-20 19:40:40.751   Dest DLL name: user32.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: TranslateMessage
2021-05-20 19:40:40.751   DLL name: setup:user32.dll
2021-05-20 19:40:40.751   Dest DLL name: user32.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: DispatchMessageA
2021-05-20 19:40:40.751   DLL name: setup:user32.dll
2021-05-20 19:40:40.751   Dest DLL name: user32.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: InternetOpenA
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: InternetSetOptionA
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: InternetConnectA
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: HttpOpenRequestA
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: HttpSendRequestA
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: HttpQueryInfoA
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: FtpOpenFileA
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: FtpGetFileSize
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: InternetReadFile
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: InternetCloseHandle
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: InternetGetConnectedState
2021-05-20 19:40:40.751   DLL name: setup:wininet.dll
2021-05-20 19:40:40.751   Dest DLL name: wininet.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: AddFontResourceExW
2021-05-20 19:40:40.751   DLL name: gdi32.dll
2021-05-20 19:40:40.751   Dest DLL name: gdi32.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: RemoveFontResourceExW
2021-05-20 19:40:40.751   DLL name: gdi32.dll
2021-05-20 19:40:40.751   Dest DLL name: gdi32.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.751   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.751   -- DLL function import --
2021-05-20 19:40:40.751   Function name: ConvertPNGToBMPA
2021-05-20 19:40:40.751   DLL name: files:inno-imgconvert.dll
2021-05-20 19:40:40.751   Extracting temporary file: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\inno-imgconvert.dll
2021-05-20 19:40:40.751   Dest DLL name: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\inno-imgconvert.dll
2021-05-20 19:40:40.751   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: ConvertJPGToBMPA
2021-05-20 19:40:40.767   DLL name: files:inno-imgconvert.dll
2021-05-20 19:40:40.767   Dest DLL name: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\inno-imgconvert.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: OpenSCManagerA
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: OpenServiceA
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: StartServiceA
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: CloseServiceHandle
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: ControlService
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: CreateServiceA
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: DeleteService
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: ChangeServiceConfigA
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: LockServiceDatabase
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: UnlockServiceDatabase
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: QueryServiceConfig2A
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: ChangeServiceConfig2A
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: ChangeServiceConfig2A
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: ChangeServiceConfig2A
2021-05-20 19:40:40.767   DLL name: advapi32.dll
2021-05-20 19:40:40.767   Dest DLL name: advapi32.dll
2021-05-20 19:40:40.767   Importing the DLL function.
2021-05-20 19:40:40.767   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.767   -- DLL function import --
2021-05-20 19:40:40.767   Function name: CreateUpdateSchedule2
2021-05-20 19:40:40.767   DLL name: setup:files:SDTasks.dll
2021-05-20 19:40:40.767   Extracting temporary file: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\SDTasks.dll
2021-05-20 19:40:40.814   Dest DLL name: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\SDTasks.dll
2021-05-20 19:40:40.814   Importing the DLL function.
2021-05-20 19:40:40.814   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: CreateImmunizationSchedule2
2021-05-20 19:40:40.814   DLL name: setup:files:SDTasks.dll
2021-05-20 19:40:40.814   Dest DLL name: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\SDTasks.dll
2021-05-20 19:40:40.814   Importing the DLL function.
2021-05-20 19:40:40.814   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: CreateSystemScanSchedule2
2021-05-20 19:40:40.814   DLL name: setup:files:SDTasks.dll
2021-05-20 19:40:40.814   Dest DLL name: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\SDTasks.dll
2021-05-20 19:40:40.814   Importing the DLL function.
2021-05-20 19:40:40.814   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: CreateMRUScanSchedule2
2021-05-20 19:40:40.814   DLL name: setup:files:SDTasks.dll
2021-05-20 19:40:40.814   Dest DLL name: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\SDTasks.dll
2021-05-20 19:40:40.814   Importing the DLL function.
2021-05-20 19:40:40.814   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: RunUpdateSchedule
2021-05-20 19:40:40.814   DLL name: setup:files:SDTasks.dll
2021-05-20 19:40:40.814   Dest DLL name: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\SDTasks.dll
2021-05-20 19:40:40.814   Importing the DLL function.
2021-05-20 19:40:40.814   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: DeleteUpdateSchedule
2021-05-20 19:40:40.814   DLL name: uninstall:{app}\SDTasks.dll
2021-05-20 19:40:40.814   Skipping.
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: DeleteImmunizationSchedule
2021-05-20 19:40:40.814   DLL name: uninstall:{app}\SDTasks.dll
2021-05-20 19:40:40.814   Skipping.
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: DeleteSystemScanSchedule
2021-05-20 19:40:40.814   DLL name: uninstall:{app}\SDTasks.dll
2021-05-20 19:40:40.814   Skipping.
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: DeleteMRUScanSchedule
2021-05-20 19:40:40.814   DLL name: uninstall:{app}\SDTasks.dll
2021-05-20 19:40:40.814   Skipping.
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: SetServiceDefaultFailureActions
2021-05-20 19:40:40.814   DLL name: setup:files:SDTasks.dll
2021-05-20 19:40:40.814   Dest DLL name: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\SDTasks.dll
2021-05-20 19:40:40.814   Importing the DLL function.
2021-05-20 19:40:40.814   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: LoadLibraryA
2021-05-20 19:40:40.814   DLL name: kernel32.dll
2021-05-20 19:40:40.814   Dest DLL name: kernel32.dll
2021-05-20 19:40:40.814   Importing the DLL function.
2021-05-20 19:40:40.814   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: SetFileAttributesA
2021-05-20 19:40:40.814   DLL name: kernel32.dll
2021-05-20 19:40:40.814   Dest DLL name: kernel32.dll
2021-05-20 19:40:40.814   Importing the DLL function.
2021-05-20 19:40:40.814   Successfully imported the DLL function. Delay loaded? No
2021-05-20 19:40:40.814   -- DLL function import --
2021-05-20 19:40:40.814   Function name: MoveFileExA
2021-05-20 19:40:40.814   DLL name: kernel32.dll
2021-05-20 19:40:40.814   Dest DLL name: kernel32.dll
2021-05-20 19:40:40.814   Importing the DLL function.
2021-05-20 19:40:40.814   Successfully imported the DLL function. Delay loaded? Yes
2021-05-20 19:40:40.814   Preparing font....
2021-05-20 19:40:40.814   Extracting temporary file: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\WorkSans-Regular.ttf
2021-05-20 19:40:41.111   [i] Skipping whitelist copy, no previous installation found.
2021-05-20 19:40:41.111   Updating font....
2021-05-20 19:40:41.126   InitializeWizard_UninstallOldVersionFirst.enter
2021-05-20 19:40:41.126   GetUninstallInformation.enter
2021-05-20 19:40:41.126   GetUninstallInformation.leave
2021-05-20 19:40:41.126   InitializeWizard_UninstallOldVersionFirst.leave
2021-05-20 19:40:41.126   Extracting temporary file: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp\PrivacyPolicy.rtf
2021-05-20 19:40:41.142   InitializeWizard.enter
2021-05-20 19:40:41.142   InitializeWizard.InitServices
2021-05-20 19:40:41.142   InitializeWizard.InitTasks
2021-05-20 19:40:41.142   InitializeWizard.CreateInputOptionPage(...EasyModeHeader...)
2021-05-20 19:40:41.158   [i] DwinsHs_CurPageChanged(wpWelcome)
2021-05-20 19:40:41.158   [+] DwinsHs_NextButtonClick(wpWelcome)
2021-05-20 19:40:41.158   NextButtonClick_UninstallOldVersionFirst.enter
2021-05-20 19:40:41.158   NextButtonClick_UninstallOldVersionFirst.leave
2021-05-20 19:40:41.158   NextButtonClick.enter
2021-05-20 19:40:41.158   NextButtonClick.leave
2021-05-20 19:40:41.158   [-] DwinsHs_ShouldSkipPage(105)
2021-05-20 19:40:41.158   [i] DwinsHs_CurPageChanged(105)
2021-05-20 19:40:41.158   [+] DwinsHs_NextButtonClick(105)
2021-05-20 19:40:41.158   NextButtonClick_UninstallOldVersionFirst.enter
2021-05-20 19:40:41.158   NextButtonClick_UninstallOldVersionFirst.leave
2021-05-20 19:40:41.158   NextButtonClick.enter
2021-05-20 19:40:41.158   NextButtonClick.leave
2021-05-20 19:40:41.158   [-] DwinsHs_ShouldSkipPage(104)
2021-05-20 19:40:41.158   [-] DwinsHs_ShouldSkipPage(105)
2021-05-20 19:40:41.158   [i] DwinsHs_CurPageChanged(104)
2021-05-20 19:40:41.158   Failed to proceed to next wizard page; aborting.
2021-05-20 19:40:41.158   Got EAbort exception.
2021-05-20 19:40:41.158   Deinitializing Setup.
2021-05-20 19:40:43.157   Failed to remove temporary directory: C:\Users\WDAGUtilityAccount\AppData\Local\Temp\is-4D18I.tmp
2021-05-20 19:40:43.157   Log closed.