That said, I very much like Codeweavers’ approach [0], which IMO is the modern equivalent to purchasing software on a physical medium: you buy it, you can re-download it as many times as you’d like, install it on as many machines as you’d like (single-user usage only), and you get 1 year of updates and support. After that, you can still keep using it indefinitely, but you don’t get updates or paid support. You get a discount if you renew before expiry. They also have a lifetime option which, so far, they’ve not indicated they’re going to change.

I have no affiliation with them, I just think it’s a good product, and a good licensing / sales model.

[0]: https://www.codeweavers.com/store