The upgrade is performed using the Mutiny web interface and no specialist knowledge is required.
After you have downloaded the files from the Mutiny download page, you may need to rename them back as they will now be .gz files and should be .gpg (some strange browser feature)
Please note the maintenance interface uses non-standard ports. If you are using HTTP then the maintenance is on port: 81 if you are using HTTPS then it will be on port: 444
Select the Backups Tab and download your latest backup. If you don't have the backup tabs or a recent backup, log back into the mutiny front end and go to [Admin]=>[Backup/Restore] and save a new snapshot and download it.
Select the upgrade tab
The upgrade will now proceed and you will see the progress bars and a complete message at the end of the process.
THERE IS NO NEED TO REBOOT unless you see a message at the top of the screen telling you to.
If you need to reboot, please wait at least 5 minutes to allow post-install processes to complete.