3) Only copy the following from the crack into the game directory -> "AppxManifest.xml"
4) In the games directory -> "InstallApp" Run (With admin rights)
5) Close the window and copy the rest of the crack
6) Now in the Start menu is also Forza 7 - start over it.
*1):
Tap on the Windows-key, type Settings and load Settings - Modern application when the search results are displayed. You can also use the shortcut Windows-I instead which also opens the Settings application on Windows 10.
Switch to Update & Security > For developers to display the new features.
There you may enable "developer mode".
If you get error 0xC00CE1A1 here's a solution provided by lanceloth: (CRACK IS ALREADY PATCHED.)
Which is found twice in the AppxManifest.xml file (you'll find it in the game directory) instead of once. To solve the problem just do a backup of the file (just in case something will go wrong) and then delete one of the two identical lines in the file.
IF THIS doesn't help also do a backup of the AppxManifest.original and proceed to edit the one in your game folder, you will find roughly the same line (in this file there's just one btw so i don't think it could be the problem, but anyway) just delete it, save both files and try to run the installer again.
Additional thanks goes to walksonpoo for testing the solution.