If he got a license (which i doubt if he sends you pirate versions of software) then he can change the URL connected to his license. Until that you are techinically running illegal vBulletin software and legal actions could be taken. Only sites registered with a license are allowed to use the software.
If you have not made any file edits, upgrading to an officail version of the software would be as easy as to re-upload the files.
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