So I decided to get my butt handed to me in the Siege of Cragholt before going to talk to the Duc about animancy. The whole section is glitched to all ends of everything. I enter the area and dialog does not start with the two sentries, they just stand there. I can steal from the sleeping Orlan but then I can just walk past every encounter as the AI scripts don't appear to be loading. Additionally I'm getting intense graphical errors. I've tried downloading the latest patches from GOG (where I purchased the game) but they tell me my version of the game is more recent. I'm not sure how to fix this issue and would love to get some advice so I can get my face caved in by mercenaries.
Here's some screenshots and videos:
Everything is magenta.
Lots of magenta and just waltzing past encounters unstealthed as they stand there not aggroing.
Here's a video just under three minutes that shows me interacting with this buggy mess.
What should I do?