What files is it looking for? I had to make some alterations to the P3D executable to get Ultimate Traffic 2 and TIR to work, it's now called P3D.exe. However, changing that file back to it's default name made no difference. What exactly is the installer looking for?
The P3D registry keys should point to the correct folder AND a Prepar3d.exe executable, of the correct version (meaning=not manually altered) must be there.
If the installer doesn't see your P3D, it can only due to one of the following, or a combination of all of them:
- The P3D registry key is not pointing to the folder you have installed P3D.
OR
- The executable is not named Prepar3D.exe
OR
- The file version of the Prepar3D.exe.exe doesn't match a supported version. The installer doesn't care about the build, it only checks if the major version is 1, 2 or 3 for P3D.