So I was looking through the list of installed games and it showed Payday 2 Beta and Payday 2. I go into Steam and it doesn't show Payday 2 Beta, only Payday 2. The I go into the Steam folder and see both Payday 2 (about 17 GB) and Payday 2 Beta (about 11 GB). That shit was taking up 11 GB of space! Check yours to make sure it's uninstalled.