Hi, I have a similar problem on my son's win 10 PC.
I click EngRel.exe
Then a black square appears (starting the game I assume)
Then the following error message comes up (before any intro has begun):
'Dark Omen has failed due to an incompatible DirectX version or out-of-date display drivers'
I have followed the install instructions on this page to the letter: http://forum.dark-omen.org/help-section/read-me-ultimate-dark-omen-xpvistawin7win81win10-game-fixes-t111.0.html
Things to note:
1. I have installed it on my win 10 PC (using the instructions above) and it runs fine
2. During install on my son's PC, when asked to install direct x and 'Yes' is selected I do not see anything happening, the DO install just completes (can't remember if it did this on my PC to be fair)
3. When following the alternate install instructions on http://en.dark-omen.org/dark-omen-and-windows-vista.html the game opens fine but has the CD check problem (http://forum.dark-omen.org/help-section/cd-missing-while-cd-is-here-t1289.0.html) stopping you from playing the campaign
4. The only display driver on my son's PC is the Intel(R) HD Graphics driver
I have tried a dozen or so different ways with a fresh install each time, but alas.
Any help you can give would be most appreciated
Thanks,
Astargoth