6.2.2
https://www.state-machine.com/qm/history.html#qm_6_2_2
NOTE for macOS users:
Because the file qm_6.2.2-macos.dmg is not coming from the Apple Store, after downloading you need to launch a console and change the attribute of this file:
$ xattr -c qm_6.2.2-macos.dmg