Unfortunately I was unable to get it uploaded on Mod DB or GameFront, so I had to upload it somewhere else... 2shared. Let's hope that it can still be uploaded here in the future.
-Remove any outdated version of the Apocalypse actual mods! (non-expansion).
-Run the installer.
-Start Dawn of War Soulstorm.
-Go into GameManager.
-Select the Ultimate Apocalypse actual mod.
-It will ask you to restart soulstorm... agree.