Well, I guess I found a reason to upgrade to Notion 6.
I recently moved from my old PC to a new one, installed Notion 4 (from the download on the Prosonus website) and tried to register.
It was unable to contact the server, so I opened a ticket.
Notion 4 is no longer support. I can download the installer, and install it. I just can't
register it to use it.
They
did try to upsell me to a subscription to Studio One+, I guess on the assumption that I must really love buying things that expire.
Well done, Prosonus.

In fairness, the also suggested I download their free Notion Mobile app, which will load my simple Notion leadsheets. But it's not Notion, and it's a mobile app running on a PC.
