Hi Pete,
I have similar or related problem. During install of FSUIPC it says it can't find Prepar3D and when I point to the exe file it still says its not there. Then I cancel the further installation, in any case the plug in is there in Prepar3D and works with limited functionalities, but the registration buttons are not activated and don´t work. I need a full working version for saitek panels etc.
By the way I made the mistake of allowing Prepar3D to install itself only c drive in the x86 program, directory, later on I moved it to a specific flash drive. Could this be the problem?
How can I get that solved manually??
Thanks,
Joaquin