Update fails if not admin, but SSD thinks it has been updated
If you run the Spybot Updater as non-admin during one of the update episodes which updates the program (not just the datafiles), it will complete the downloads, kill off the program, then fail to install the update. However, on subsequent update runs, the updater "thinks" the update has been completed successfully.
The only way I could fix the problem was to log in as an admin, remove SSD, reboot, re-install SSD as admin, then update as admin.
IMHO the updater should insist on admin rights before starting, much as the immunizer does, to prevent errors like this.