I've seen somewhere here that someone uses his "other install" of JKA to do something which I can't remember, so I'd like to know how to install JKA once again. When I explore and click Setup, it is an uninstall..
you mean reinstall? or what?
He means have JA installed in two places on his computer.
I have that. Easy. Of course, one isn't in your system registry and another is, so it may cause a bit of trouble if you try to uninstall - you'll have to delete it manually if you desire to in the future.
To do it, just copy and paste your JA into a new directory. That easy. I run a server that way - it allows me to play JA with certain mods and yet have them not supported by my server.
So it's not install-directory protected? Ooh!
Or, you just simply open the setup launcher from the CD which will bypass all those other checks and you can select a new folder, simple as that ^_-