Game is taking space in my drive but its says I have to reinstall it.

I moved Forza 7 to a new drive on my PC 5 days ago and been having problems running it, the game is using 96 GB on my drive but its says I have to reinstall it (repair). I was like ok fine maybe I’ve encountered a problem while transferring it, the thing is that im trying to download a 100 GB file over 1.2 MB down speed. even worst after 3 days of downloading the download went going just like a post was posted a while ago and last time i checked it was 130 GB, Today when i woke up it started from scratch?? I cant take this anymore the internet is unusable while downloading due to the low download speed, is there any way to fix this? Thanks!

Send an email to forzafb@microsoft.com with your gamertag, game version, and platform platform details.

ok thanks