Also look in C:\Program Files\WindowsApps\MutableBackup
I had 259GB in there, still trying to remove it now
I tried to delete the whole folder for the game, it backfired and broke it in the Windows Store. I had to reset my PC to get the game working again.
That's exactly what I'm doing, I have another HDD in my PC so will install on there if all else fails, definitely not going to format.
BEST of luck to you!