Oh my… this web site is one of the most frustrating web sites I’ve seen in a while, style 1995.
Try getting a temp license for example - if you’re clicking the obvious links you’d be locked in a circle between two pages.
The purchase control is pretty unintuitive itself, whoever built it has had little experience building UI - gray buttons usually mean they are disabled, number controls are the weirdest I’ve seen. If the whole web uses “shopping cart” concept maybe it’s because it makes sense…
I seriously hope the quality of the code in these libraries is higher than what I see on the face of it.