I found that the Prepar3D installer "Setup.exe" does not allow user to designate an alternative to the default location. I used Control Panel to uninstall because the documentation said this will not remove the dependencies installed by Setup.exe, and they are not installed by Prepar3D.msi. However, everytime I ran Prepar3D.msi it would hang or freeze at "Updating Component Registration." This puzzle was clarified when I ran Setup.exe again and found it believed that the program was still installed so I used it to do an uninstall presuming that would fix the registry error that I believed to exist. Finally, running Prepar3D.msi again allowed me to install on my F: drive, and digging turned up F:\P3D\redist\Interface\FSX-SP2-XPACK\retail\lib\SimConnect.msi which I ran to ensure that particular dependency was satisfied.

 

Short story: Setup.exe doesn't allow alternate locations. Prepar3D.msi must be used for installation and you are on your own to ensure program dependencies are satisfied. In my case, running a new Win7 installation, I only had to run SimConnect.msi to satisfy dependencies.

 

This post is to help someone else that comes along as I did and didn't find anything using the AVSIM search on "change install" Hope this helps.

Considering that I installed Prepar3D v2.4 just two days ago using the Setup.exe method, and use the Options button to change the installation path to C:\Lockheed Martin\Prepar3D v2 without any problems, I have to conclude that Setup.exe does indeed work as designed.

 

Perhaps you simply missed noticing the "Options" button.