[@mardel53] Please unpack the zip folder. In it you will find vc_redist.x64.exe and vc_redist.x86.exe. These files are the visual studio library Perfect PDF needs. Normally, if not installed, the program setup starts one of them automatically while installing Perfect PDF – dependant from your OS. Please start setup.exe, this is the Perfect PDF installation. The Perfect PDF installation will install both instances (x86 and x64 of Perfect PDF) on your computer (if you have a 64 bit OS).