We're still a few weeks away from the arrival of Forza Motorsport on Xbox Game Pass in October, but if you want to be ready ahead of time, you can now begin pre-installing the full game on Xbox Series X, Xbox Series S and PC!
The biggest download size seems to be for the Xbox Series X version, which clocks in at just over 132GB:
Xbox Series S owners appear to be seeing a download size of around 97GB right now, while the PC version comes in at 118.9GB. Obviously all of this could change if any pre-launch updates are pushed out over the next couple of weeks.
Don't forget that although Forza Motorsport arrives on Xbox Game Pass on October 10th, XGP members can begin playing it as early as October 5th by picking up the special Premium Add-Ons Bundle on the Xbox Store.