Where is Owncloud Apps+ in Nethserver 6.7?

OK.It's worked.APPS+ is visible .Why duplicate admin account in system ? Same user name is "admin"

and another questions ;

I'm trying to install 3rd party apps and error.
"App can't be installed because of not allowed code in the App"

and admin page error.
"Your PHP version is outdated. We strongly recommend to update to 5.3.8 or newer because older versions are known to be broken. It is possible that this installation is not working correctly."

How to install 3rd party apps in apps.owncloud.com ?

How to upgrade owncloud to last stable version 8.2 ?

Thank you.