The base Stock game MUST be unmodded, is what they mean. So if you have v1.01 or v1.3, no matter, de-activate all mods, cut your MODS folder and paste it elsewhere for safe-keeping, then un-install SH4, re-install, and then put that SH4 v1.4 executable patch in the SH4 game folder, and run it as an administrator. It should then run properly. Be aware, if you have a Steam version of the game, the Ubisoft v1.4 Patch will not function correctly. If you are in the US, you cannot argue with $2.50US for
Silent Hunter 4 Gold Edition