It appears there is something wrong with the program file or the installer. When I now install the program, the same problem occurs as some of you have experienced. That's odd, it didn't happen before.
For those willing to take the risk
, here is the working program file. Replace the messed up .exe file and Fastcache will work the way it should. It is the latest version (1.03), but I downloaded this several months ago, before the "installation problem".