Re:OS X El Capitan on the Mac App Store
by eridius on Wednesday September 30, 2015 @04:10PM
(#10306756)
Are you on public beta or developer beta? Those instructions appear to be for the public beta program. If you were using the developer beta, I expect you have to reinstall the seed configuration utility (if you don't still have it) from https://developer.apple.com/osx/download/ and use that.
https://beta.apple.com/sp/betaprogram/unenroll