Start a command prompt. Cd to your mods folder. Type the following:
Code:
Mk ink /J "caveman to cosmos v20" "caveman2cosmos"
(assuming your folder is 'cabeman2cosmos'). This creates a directory join (a kind of alias) so that the content of 'caveman2cosmos' also appears under 'caveman to cosmos v20'. There is only one real copy though, so if you modify it in either it will change in both - it just provides a synonym in naming terms for file paths.
I have about a dozen aliases like this because of all the variety of names peope use and send me save games for.
Also, to avoid having to reload when you specify the save to load you can change the mod name in your INI file before launching bts.