Hi, I downloaded GOG's iteration of this game then downloaded both the official and unofficial versions of keeperFX, both versions had the same issue.
I installed Dungeon Keeper gold, renamed game.gog to dungeonkeeper.iso and mounted that same file.
I opened launcher.exe clicked installation then guided the installation path to the gog directory and subsequently the dungeon keeper folder.
When I clicked start game after a successful install a small window would pop up then immediately close.
If I run gog's version of dungeon keeper I face no issues with gameplay. If I run keeperfx.exe I get a jittery and unplayable version of the game.
Where did I go wrong and how can I solve this issue? Thanks.