you have to use gog edition from the scroll down menu in flawless and when you replace your exec you have to replace paul.dll as well and run both as admin running actual file not the launcher.
Ah, thanks, that did it - I hadn't replaced the paul.dll before since they're the same size.
e: Although - and this is strange - if I launch the game directly instead of using launcher (which is needed to get this program to work), there's an annoying blur or DOF filter on the screen any time I move my character. This doesn't happen when I launch game from launcher, even if I have all the DOF and blur stuff enabled there.
Very strange. I did some further testing and it happens as soon as I use the "remove vertical black bars" checkbox. I don't have vertical black bars, but unchecking the setting reintroduces the horizontal black bars.
So long story short, going to 16:10 AR with this program introduces some annoying and heavy handed blur effect if you even walk around in-game, at least for me (using GOG exe and paul.dll on D2D installation).