So just how can we get a working editor for those that purchased from GOG?
I also use the GOG version and yeah the editor is still out of date. It was actually up to date until the most recent patch which is also rare.
Last time I sent larian support an email and they updated it about 2 weeks later IIRC. I suggest you do that in case they miss this thread.
Since I have both the steam and GOG.com versions of the game I simply copy and paste the editor files from steam to use for my GOG copy. So I stopped bugging them after every patch.
