Every time I try to play the DLC by finishing the game, it crashes. I press Esc to end the credits, the map appears, and then the game crashes. I've uninstalled and reinstalled the DLC, but the issue persists.

Windows 7 Professional
AMD FX-8350 CPU
ASUS M5A88-V EVO Motherboard
16GB DDR3-1600 RAM
250GB SAMSUNG 850 EVO SSD - OS
1TB Crucial MX500 SSD - Games
AMD RX-580 8GB GPU

Update:
I added the game to GOG Galaxy (didn't want to but had to try something) and I'm now enjoying the expansion. it still crashes when I close the game though...