No, I did not restore Windows. Sorry for the confusion. Within running Windows I did following: (first exit Acrobat in case it is running, of course) a) deleted all contents of SLCache (including SLConfigs) b) opened (not restored) an image of a previous Windows, the image was opened as a virtual drive, so, let's say, X:\Windows c) using Explorer I browsed to SLCache within that virtual drive, i.e. to X:\Program Files (x86)\Common Files\Adobe\SLCache d) then copied the entire SLCache from: X:\Program Files (x86)\Common Files\Adobe\SLCache into -> C:\Program Files (x86)\Common Files\Adobe\SLCache e) launched Acrobat and the 'trial' mode was disabled, i.e. Acrobat is running as before. Now, with me, under 'Preferences->Updater->Automatically install updates' was tagged/enabled. I remember that Acrobat was updated, got this notification popup window. Thereafter it was changed into trial mode... Regretfully, even uninstalling and re-installing my licensed version did not help. Somewhere I read about messing with the SLCache, so I gave that a try. That worked out well. I wonder though, imagine the situation that this would nót have solved the issue (can this be expected from a normal end-user??) and neither an uninstall and re-install does, then what?
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