1) Download the game and patch.
2) Open Powershell and type in these two commands, by changing the paths to the correct ones:
2.1) Certutil -addStore TrustedPeople "c:\PATH_TO_KEY\MyKey.cer"
2.2) Add-AppxPackage "C:\path_to_app\forza_14.2.appx"
3) Install Visual Studio Community 2015 with the C++ packages.
4) Open \IH folder and run the RUNME.bat
5) Copy immersivehost.tlb file to your Windows\System32 folder.
6) Now Run the RUNME2.bat as Administartor
7) Open the Xbox Live app, create a dummy account, and set it to login only for the XBL app.
You can play the game by starting the shortcut on the Desktop.