Insider was working just fine. Then yesterday this error message 30088-28 came up after I tried to download the most recent update. I then tried a restart, then a quick repair, then a full repair. The full repair gave a different error message that 'something went wrong', the consequence being that Office was completely uninstalled. I then reinstalled it, restarted, and tried again to update to Insider - it came right back to the 30088-28 message!
I urgently need to get back to Insider - can someone please help me?