Quote Originally Posted by Warmaster Horus
... install it in a copy folder for RTW. That way, if you don't like it, all you have to do is delete the file in which you installed the mod. And you keep a version of RTW on your computer.
OK can I have that in idiot-sized chunks?

Install vanilla RTW / BI & patch it if required.
Copy the entire folder to a new folder.
Rename the new folder to RTW_Foo.
Apply the Foo mod to the RTW_Foo folder.
Create a shortcut to the main executable in the RTW_Foo folder.
Rename the shortcut to RTW Foo

Am I missing anything?
I assume you can run either instance ?