This post is going to make me look like a bit of a fool (and I can't edit my previous post, guessing because I am a non-approved member), but it turns out I had downloaded the wrong version of the patch (it's just an excuse, but wasn't expecting to see the patch under DLC) - if you've got TWM I installed and are a gog user, make sure you download the TWM I version of the 2.01 patch instead of the generic version of the patch. Game works fine now!
