can't redownload forza horizon 2

Delisted games must be downloaded from your purchase history

1. Sign in to Xbox Live on your console using the gamertag you used when you purchased the content.
   
2. Go to settings and select Account.
   
3. Select Download History.
   
4. Browse your download history and find the item you want to download again.
   
5. Select the item, and then select Download Again.
   

Delisted games must be downloaded from your purchase history

how do i do that on xbox 360?

First thing you should do is delete the game. Then delete the your system cache. Once you have done that, then download 1 or 2 demos that is the same size as Forza Horizon. Then redownload Forza Horizon. Play Forza Horizon. If the problem has gone,
you can delete the demos.

A common problem which sometimes is easy to fix. Your best bet would be to delete the game, then download 1 or 2 demos that are the same size as forza horizon (Your talking about 5 or 6GB). Once the demos have finished downloading, then redownload forza
horizon. The reason to do this is so Forza Horizon is installed to a different part of your hard drive. Which then will hopefully fix your problem.