I hadn’t tried installing manually, just the Update in the App Centre
Following your link I downloaded HD_Station_4.2.18_x86_64_20250430.zip and opened the Manual Install dialog.
It seemed to go well, as it recognised it as an application package and started to install.
However, after the “chunter, chunter” from the drives, it sounded 3 beeps, and now we now have
for the last 10 minutes