2 copies of game for MOD purposes?

[Ze-Jamz]

I posted this in another thread but it may be useful for others to know..

Is it possible to have 2 copies of the game side by side? I'm liking Jaffa's sounds alot and want to be able to enjoy them in game.. I had another copy on my hdd which had the mods installed for offline use and another clean install that was used for online play.

For some reason I can't get the mod install to work. I.e it will just fire up steam and be a clean game, am I missing something or have they done something in the last patch to prevent this from happening?

I have cloud etc disabled in Steam.

Am I able to achieve what I want here?