MGTommy

What I find interesting, is I run two installs, and simply change directory name to switch between modded game and vanilla for online play. This system hasn't failed me,...until now. I purposely updated my vanilla install to get the update out of the way. After the update was completed, I put steam in offline mode, renamed directories and launched rph. 
Received the same SC out of date error. I checked, and none of my modded game files had been updated, only file to show today;s date is the rph log. Modded game worked fine last night. 

Double checked modded install, double checked I ran Steam in offline mode prior to launching the game. My Current RSC version in my modded game directory is 1.1.7.8. I tried adding -scOfflineOnly to commandline.txt... No Joy. 

Steam must have check to see which version you're on prior to launching? This would make sense if it was the updated folder and /or I ran steam in online mode. Odd indeed. I will have to try the above tip to see if that helps. 

EDIT: It just hit me that RSC is system wide and due tot he fact I updated my vanilla install, it updated the RSC on my pc. DUH! LOL!

Uninstalling 1.1.9.5 and reinstalling 1.1.7.8 fixed the issue. 
.Uninstall RSC through your windows 'add or remove programs panel' - Just like any other software.