You are using the current version. I wanted to be sure.
The only way to re-register for the free version via the GUI is through
the "maintenance" tab. As I stated above the "market" tab is for shopping and "not" for
registration. The screenshot you first posted showed that you are currently using the free version
and shows your options to upgrade if you so desire.
edit: Click on the "market" tile, then see your options. GUI>click on "home">click on the "market" tile.