I want to user Creative Commons 4.0 license in my MediaWiki installation. But when i installed the software via installer and check the site i found that it is showing a link of version 3.0. Is there any reason not to include the CC 4.0 licenses?
Replacing the entries in the installer's licence selector with 4.0 instead of 3.0 is probably not a good idea for now. CC 4.0 is incompatible with 3.0 -- as we probably don't want want to preclude users copying things from Wikipedia to their own wikis (and back), it's probably best to stay with 3.0 for now. Adding both versions to the selector would probably be too confusing.