For everyone on xbox who is having a problem with the installation of the season 8 update there is a solution! (Maybe)
- Install the Xbox Insider Hub. This is different from Halo: MCC Insider and is free for all users. - Uninstall Halo: MCC Insider - Launch the Xbox Insider Hub and agree to the terms and conditions. - Go to Previews and go to the MCC insider program - Join the MCC Insider program and allow it go through its verification process - Install the Halo: MCC Insider FROM THE SHORTCUT GIVEN THROUGH XBOX INSIDER HUB. - After installation restart your xbox Settings > General > Power mode & startup > Restart Now - If the update still hasn’t happened repeat step 2 and 6. - If that doesn’t work check to see if you were invited through Waypoint. - If that fails submit a ticket.
These steps may not be guaranteed but it worked for me and some other people. If anyone else has solutions that worked please share them.