running sudo softwareupdate -l from terminal did not give me anything. And app store ask me to download the 5GB+ installation file of the final version.
I am currently running on gm candidate 3.
Can I install and recover the current system using the installation file or wait and try the upgrade? Will the upgrade procedure work in this case?
http://www.imore.com/yosemite-gm-3-or-public-beta-6-and-wondering-how-update-final-release
If you're already running OS X Yosemite gold master release candidate 3 (GM 3) or public beta 6 (PB 6), you won't need to update to the final release version in the Mac App Store (MAS). While there are minor differences in build numbers between the versions, Apple is considering both GM 3 and PB 6 as "final" and not offering the MAS version to anyone with either of them already installed.