I just downloaded DK2 again and noticed there is a new GoG graphics mode in the options, so I take it that GoG fiddled with the game. Did they by chance also fix the portal bug in the later campaign levels or do I still have to replace the kld-files with the ones somebody posted here years and years ago?

Hi,
I have never experienced any problems with 'portals'.
I have played it on Win7 and Win8.1.

I think PsychoWedge might be talking about the dark angels and black knights not appearing in some of the last levels. I don't know about that myself, the last time I played(not with this patch) they didn't.

yes, that's what I was talking about.

In resume to your question: You still need to apply the unofficial fix for getting the dark angels and dark knights.

Take in account that Gog only touch the games for guarantee the compatibility with the O.S.
Forgotten fixed in official patch are not touched by Gog.

Well, the patch policy of gog is not consistent here, they indeed do include sometime inofficial patches. But the bigger problem is here the enforced prepatching to version 1.7 with brokwn AI. It would be better if gog would offer the vanilla v1.3 + opt. Patches.