my game always crashes after the opening vids when I have the sorian scd installed and works fine with out. Any suggestions as to why Ive tried older versions but all the same or failing that if any one can suggest a good alternative?

That sounds like your mod is not properly installed or the files are corrupted. Make sure you have the Lobby Enhancement Mod installed too.
Good luck.

yeah i have that. ive aslo tried installing from the exe and zip, the lobby enhancement works just not the sorian ai pack ive got the pemperf ai and the other one for fa duncans or someones i dont recall its name right now and the all work fine just not sorians

I can't remember if Sorian's still comes with it bundled or not, but if there is the ai_support file in there, too, pull it out. I want to say when Sorian created the enhanced lobby it was no longer required and he said it would even cause issues if all three were loaded at the same time.