I downloaded the "Blue Lagoon" CPanel theme. Currently, it has a tar.gz extention. I've heard that the extension must be .cptheme, is this true? Do I simply rename the file?

That is a compression file like a .zip . In Windows, you'll need a program to uncompress the file, it's called PowerArchiver. Search for it on google because I'm to lazy to do it now :)

Greg

just rename the file. Get rid of the .tar.gz and make it .cptheme

And fyi, you can open tar.gz files with winzip

For some reason it won't work, I get an error message saying:

"Checking Theme integrity......Sorry.. that's not a cpanel theme tarball!"

Hate to refer you to another forum, but there's a good answer to your question on the CPanel forums! (http://forums.cpanel.net/read.php?TID=1680) and in that thread in particular.

Good luck!