Maybe they are in the process of fixing it. Now, the file is not available at all:

[00:00.000] [i] Update started...
[00:00.002] [+] Updating Service is active.
[00:00.003] [.] Trying to retrieve update info file from http://updates1.safer-networking.org/spybotsd2.uid...
[00:00.130] [+] Retrieved update info file.
[00:00.272] [.] Info file part done.
[00:00.325] [+] Adware-C.sbi (version 20220330) needs to be updated (to version 20220406).
[00:00.328] [.] Downloading updates...
[00:00.331] [+] File "Adware-C.sbi" needs to be downloaded.
[00:00.634] [+] Unable to download archive "Adware-C.sbi-20220406.cab" from http://sbsd-dl-uk.com/spybot2/!
[00:00.966] [+] Unable to download archive "Adware-C.sbi-20220406.cab" from http://updates2.safer-networking.org/spybot2/!
[00:01.317] [+] Unable to download archive "Adware-C.sbi-20220406.cab" from http://sbsd-dl-eu.com/spybot2/!
[00:01.318] [+] All files have been processed.

So, like you, I will just keep trying