Solved Cannot Upgrade from 16 to 18 - Take a Full Backup

[healthy]

I am attempting to upgrade and am getting the following error which is preventing upgrade. I have, of course, gone and selected everything to backup (recordings, voicemails in addition to config info) and backed up.
3CX Phone System -- Another version of 3CX Phone System is already installed. Go to the Management Console to take a full backup and repeat the installation process.

Any ideas are greatly appreciated.

 

[Saqqara]

Are you running 3cx on a windows machine

If so you need to backup with license key, fqdn, recordings and voicemail. Move this backup out of the 3cx folders.

Uninstall 3cx, reboot machine

Install 3cx v18 and select restore from backup during the installation process

Link to windows v18 download https://www.3cx.com/blog/releases/direct-upgrade-v18/

 

[healthy]

Thanks so much @Saqqara