While updating Plesk, the Plesk installer shows only the latest version of Plesk. Follow the below steps to show all possible versions of Plesk available
1. Download Plesk Installer
wget
https://autoinstall.plesk.com/plesk-installer2. Add execution permission to plesk-installer
chmod +x plesk-installer
3.Now, run plesk installer with --all-versions to get the list of all available versions
plesk-installer --all-versions