Can not install forza horizon 4 on my pc

forza horizon 4 and the expansion installed on my other PC just now fine. there has got to be a way to fix to install on my PC with the EVGA 1080ti and 5K monitor. that PC boots to an M.2 drive so I have the store installing games on a new crusial SSD.
Ive thought about uninstalling and re installing forza H 4 but Im afraid it might not install again. Any help with this would be greatly appreciated

I think you should download Forza Horizon 4 Repack.
As it will also include some save game files. Its size is too low so you can download it in a matter of minutes. Even the installation is not a big issue too. After the instant installation of this game, you can start from the beginning. I hope my answer will
help you.

Yes. Other games are OK.

Forza horizon 4 is OK too. But I bought it.

And Forza horizon 5 uses Game Pass.

I can start Forza 5 on my PC, can not start on Xbox serious S.

Simply login into yout PC with the account that you bought the game with or have Game pass actuve, then open the app Microsoft Store and look for the game and install it, in this case Forza 4 (please note Forza Horizon 4 is a play anywhere title, if you
mean Forza Motorsport 4, it was never released for PC).

That is correct.

Forza Horizon 3, now also delisted was the first one to have a PC version

You can use the money to purchase Forza Horizon 4 or 5.