When I used this Acrobat DC portable full registered version on Windows 7, it gave this error:
Installation Problem: IMSLib not found. Acrobat services will not work.
The easiest way to solve this problem is to download and copy the IMSLib.dll (same or different) file(s) to the following 3 locations (in the path, if some folder does not exist, create it!):.
That's all!