Hello Mazen, welcome to the .Org . Apologies for the slow response: I was unable to go on-line for a couple of days.

It's been a long time ago since I installed the patch, but IIRC there was a separate patch available for Gold as opposed to regular edition. If it was bundled with Barbarian Invasion, it requires patch 1.6, not 1.5.

Hope this helps! This is not a game mechanic, so I am moving this thread to the main forum.