3
wow - 40 minutes of patience with a non-vital problem.
you COULD try a search for themes, installation and maybe tar.gz and find out something.
you COULD try to look in the xoops-2.0.5/html/themes folder to see how the default themes are placed
Then you would learn that you just unpack the theme (with subfolders) and upload the entire directory to the root/themes directory.
Sorry for the harsh words, but it's really a waste of my time to read through forums, find topics called "HELP" or similar topics which don't say much about the problem just to find something, you could have found out for yourself.