Forza Horizon 3 update forces PC users to download entire 53GB game again, turns out to be unencrypted dev build revealing future cars

Forza Horizon 3 has had a rough day.

Forza Horizon 3 has been updated to support the latest DLC, which is as it should be. Unfortunately, the patching process has not been as it should be.

Similar to a recurring problem on Xbox One, PC users found that the "update" was actually re-downloading the whole of Forza Horizon 3 itself - a hefty 53 GB. Whoops!

That's not great of course, but it gets messier. As NeoGAF and Forza forum users discovered, the newly downloaded game seemed to be an unencrypted developer build of Forza Horizon 3, with references to stacks of cars that aren't announced for the game yet.

As noted on the Forza forums, Turn 10 has addressed the issue and it's now safe to go ahead and update - but not before screenshots of the car folder were added to Imgur. The Forza Horizon 3 playerbase labelled this as a spoiler, so I'll just leave the link there, although I'm not sure how knowing what's coming in DLC could ruin your experience.

Unfortunately, if you did complete the full download of the incorrectly uploaded Forza Horizon 3 dev build, you'll need to reinstall the full game - which means downloading it again.

"The incorrect PC version of FH3 has now been removed and replaced. PC players who have the FH3 version ending with .37.2 should immediately uninstall that version of the game, then re-install. The correct playable version should end in .35.2," Turn 10 advised.

"PC players who completed the download of .37.2 and then started a new game save will have a corrupted saved game. Avoid creating a new saved game on .37.2, and only play on .35.2 to avoid this issue. As long as you have an existing save and have not created a new one on .37.2, your saved game will work correctly once the update is available."

Bit of a struggle for Forza Horizon 3 today, then. Hope your patching process was as smooth as possible and the leak provides some interest.