The 2014 version (version 9) isn’t mentioned, and definition updates are still being provided so that isn’t the reason why.

It all went wrong after I got an action centre notification about having no anti-virus protection which I thought was a bug since it’s happened before so I did a full shutdown and started the laptop up again only to find windows defender was running and avast was showing that I wasn’t protected and trying the fix the issues didn’t help so I did a reboot (not a full shutdown) and avast started working as normal but windows defender was still running and I had to access windows defender through the control panel and manually disable it to get it to work.

Also as I said, doing this just because of windows 10 is pointless since in the specifications it states that anti-virus programmes will be uninstalled and the latest version installed after the upgrade is completed.

For Anti-virus and Anti-malware applications, during upgrade Windows will check to see if your Anti-virus or Anti-malware subscription is current. Windows will uninstall your application while preserving your settings. After upgrade is complete, Windows will install the latest version available with the settings that were set prior to upgrade. If your subscription is not current, upgrade will enable Windows defender.