1. Backup with license and fqdn. move backup file to local machine, or outside of 3cx folders on the 3cx server
2. Uninstall 3cx
3. reboot server
4, install 3cx, and select restore from backup during the installation process
The basic process I followed (or at least the relevant bits to you, since you're not running a virtual machine) is:
Run a full backup within 3CX. Choose License Key, Custom Templates, Voicemails. Keep backup on VM and also copy to local file server just in case.
Download latest 3CX V18.
Run Windows Update on host machine.
Restart host machine.
Uninstall V16 from within Program Files.
Install V18 from download.
During installation, at prompt choose to Restore Configuration, and amend where required (port, recordings path etc.)
Ensure Automatic Backup is enabled
Ensure Firewall Checker still passes
And after I've tested it to ensure it all works:
Update guides on Scheduling Video Meetings & Audio Conferences since web interface has changed.
Update guides to show new Windows App rather than Legacy Windows Client, for those who wish to use it.
There were additional steps beforehand that I took such as reading the V18 changelog and checking the forum posts here that were announcing each version release from v18 through to the current sub-version.
i will also chime in to make sure you move your backup to a folder outside of the 3cx folder. Because once you uninstall 3cx (which you will need to do), it will remove all the files in the folder. It's not as scary as it may look.
