The GeneXus Protection Server utility is a protection system for all GeneXus products requiring authorization.
Installation is required when sharing licenses between developers that access GeneXus on different computers of a network.
Check the documentation here.
You can download it from the Download Center; the latest version is here.
GeneXus Protection Server does not support downgrades but if a downgrade is made all licenses could get suspended. Upgrading the GeneXus Protection Server, when licenses got suspended, might fix the issue.
Protection Server Fixes