How do i re-activate a deactivated server?

In theory this is the free physical backup, version. I'm now presented with a register my server, and all of my backups are failing, when i go through the reports on the events tab it tells me my server is deactivated. I was lead to believe that the free version would not require either activation or registration. Given my server is now deactivated how does one go about re-activating it so that it can function again?

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