Yes I was wondering the same thing, why ask here.
The installers say VoodooLabs on them, so they seem pretty official as far as who made them...
Print out a Voodoo labs logo, stick it on your butt and call it official if you like.
iReset/Fabio is doing a great service for the community and lots of people are using his installers, it's an easy and convenient way to install or upgrade Chameleon.
But there is no "official" release of Chameleon 2.0 RC5. "RC" is short for "Release
Candidate". Install/Run/Test at your own risk. And I don't mean just the various installer packages that are out there, the same goes for Chameleon that you downloaded and compiled from SVN two minutes ago and installed manually.