For anyone that uses Buy Shipping -

Overnight there was an update that requires us to install QZ Tray as a “One Click” printer for Buy Shipping - I was unable to edit shipping or print any labels without installing this first and whilst the actual installation was straightforward, I also had to install Java on my computer - the easiest place to do this is at Java.com (Rather than Adoptium.net which is where the link from the QZ Tray pop-up took me).

Each label is then sent to the printer individually rather than as a single document.