Upgrade to final release of Yosemite from gold master?
All the coverage I've seen says to run what you have and 10.10.1 will convert all pre-release versions of OS X - including the latest GM candidates to the full production version.

You are free of course to go through the work to download the free version of the installer and see if it runs on your specific version of OS X but without knowing your exact build and source of the pre-release software, it's hard to be more specific.