One of those "get it free quick" deals. While Dungeon Keeper II isn't free, at $1.49, it may as well be.
The people of Eversmile must pay for their aching facial muscles! Setting up the graphics for DOSBox was a bit of a challenge for me. I finally settled on OpenGL and advmame3x. I wish my old system had enough oomph to use 2xsai. I still had to edit the conf file to change the CPU settings.
Remember, "Alt-R" to switch in-game to 640x480 resolution. Also there is a replacement for DOS4GW, which is a little better, explained in the above thread at the GOG forums. And, if you want to go through the trouble, there is "KeeperFX", as mentioned in this thread in the GOG forums, though it runs slower on my ancient machine.