Mental Omega: Almost Perfect Yuri's Revenge is a free unofficial expansion pack for Command & Conquer Red Alert 2 Yuri's Revenge. The mod retells and continues the storyline of the original game. Enhanced with Ares DLL, Mental Omega 3.3 strives to bring new features to the game, including a completely new side: the Foehn Revolt.
If you missed it, Mental Omega 3.3 with its new 4th side, the Foehn Revolt, has been released.
Troubleshooting Megathread -- Forums.revora.net
Most of the launch issues can be solved with setting proper compatibility settings and admin rights. Read the instructions.