Some time ago I had a similar problem, regarding "You need at least CSM 1.25.1140 to run this mod".
Infact I have my home PC without internet connection, so the dowloaded version of CSM was out of date and I can't made the update.
I have resolved tricking one .ini file in the mod's folder.
It's a little brutal way, but have worked fine for me
hope you can find your easy way...
bye bye
SdG