Regarding the video issue, have you tried using the rekordbox 4.3.0b2 beta?
As for the updater, it's a different application on Windows than Mac, and I find it hard to believe it crashed on each system. Was there an error message of any kind at all? Did you put your RZX into update mode by holding these buttons while powering-on the unit?


Either allow the connection or disable your firewall during the update process.