All right. Can confirm that the vanilla version runs flawless. Same.
Have you treid just running the RSMods.exe and checked the output ?
This is what I get as a response which would actucally eplain the issue with mod support:
I also checked the windwos event viewer:
Seems like the process cannot find the .dll anymore.
Same reInstalled and checked. Tried the RS2014-Mod-isntaller (as seen on chainbrains youtube channel). Flags the Steam version after the Update as pirated or stolen.