I think you need to log in with his xbox one account on your pc. They are basically one and the same (microsoft account). For example, I have to use the same log in credentials to play killer instinct on PC. There are no product codes to enter in windows since it has been done already on the XB One. It just recognises the account. And coming from someone who has Horizon 2. If its similar then yes, its very arcade like and no where near as realistic as Forza racing even when increases difficulty and removing assists.