I just tried another theme,, Black is Beautiful, and it worked. I downloaded your Morpheus theme and tried it. It also doesn't install, but gives the same error that there is not associated applciation. If I choose Adium to associate, then I get error 10814, Operation cannot be completed.

Perhaps it's just my mac for some reason...

Looks nice. However, the theme and layout files will not work my copy of adium. Okay, yeah, I'm using the beta, but I'm just sayin'

Also, the zip has a DMG file adn a weird blank file of some sort.

Cheers!