Hi @fasttech,
First, as the title of this post said, it’s about CentOS 6.8 not about NethServer 6.8 beta1.
Unfortunately from Software center cannot be made upgrade to the newer version of NS, but only for CentOS. Also from here can be made updates for current version of NS.
(There are some discutions about upgrade from Software center on this forum. One of them:
Which way do you prefer for the upgrade to 6.7? )
To upgrade NS 6.7 final to NS 6.8beta1, you must follow the procedure as @apradoc said, from here:
NethServer 6.8 beta1 Released!
or from here:
http://docs.nethserver.org/en/latest/release_notes.html#manual-upgrade-from-6-7
Generally, if you want to upgrade NS to a newer version, you must follow the procedure described in the announcements for a new version, or from
http://docs.nethserver.org/en/latest/index.html
After the upgrade to the newer version of NS, the updates for that version will be available from Software center.
Gabriel