KSP loads slowly. Sometimes very slowly. More parts and addons, slower loading. So I want to have a second instance, with no mods and only some of the stock parts, to quickly test things.
I bought my copy on Steam, so I don't have any kind of installation media. How can I install second instance on the same computer, from the same steam account? I don't want to lost my current instance as I have nice career going on (with a lot of mods).