Sage 100

Trying to install an additional module at a client running MAS90 4.5. The server can see the existing install and lets me do a maintain but then I get ""The installed version of the application could not be determined"" message and setup exits. I did a fresh install to the same folder (after renaming the existing) with the existing unlock codes and I got the Add, Maintain, Remove prompt and no error message.. I'm gathering from this that there is a file somewhere in the MAS90 folder that contains the installed version information the setup is looking for. Does anyone know the name and location of this mystical data file?

Figured it out - the Activate.pvx file must have been damaged. Copied it from the fresh install to the existing one and did not get the error message.

@BernieLehman - Thanks for sharing the resolution - now go get some sleep!