You can not install a Theme only download XD
It's for RevCMS
and you have to put it in
app>tpl>skins
if you have 2 of the same change the first instance MangoH and paste that into your Skins and and then imagine that in config ;) Success
But if you want the client work than you need a r63 swf pack.
--> http://devbest.com/threads/release-r63-with-shells-noob-friendly.29823/ <-- :)
And an emulator but i don't release that shit XD