Deleted FL11 demo, now I can't open FL12 says quickfontcache.dll did not found

This shouldn't matter. Whenever you want to upgrade FL you need to download the new demo installer and install the Reg Key-file ontop of it. So if you install a new version of FL without uninstalling the old one, they will run without affecting eachother. So uninstalling FL 11 shouldn't affect FL 12.

I'd suggest going to the Image-Line technical forum.
 
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