Why you burn your Activation? You should de-activate your product and then install. I don't remember but what i think in every module's (example \DCS World\Mods\aircraft\Uh-1H\bin\uh1_protect.exe) folder there is a bin folder and there is ProductName_protection.exe run this, from there you can go to star force site and check your remaining activation and from there you can de-activate your product. It is self explanatory.
Correct me if i am wrong, What i think on same system you can install multiple copies and it will not eat your activation.
If you want to move your game to another drive, what i suggest just uninstall your game and install it on another drive.
I hope this will help.