I've been trying to find a contact. I'm interested in becoming a paying member so I can download the latest version. The Contact Us button on the website goes nowhere.

Additionally when I click the upgrade subsciption on the downloads page I get a 404 not found

Hello Jeff, it's more than alive, we've been releasing a lot of upgrades as you might have seen.
We know about the bug in the website, sorry for that.
Please use this workaround https://association.formalms.org/user-profile.html
From here, when logged in, just go to the subscription tab and everything will work as expected.