Ah I see, so that's what it looks like when you're not using a linux distro to obtain Ardour. And no, I never pressed the button because I just get it through Ubuntu Studio, and I've been using Ardour for years, for my simple (but frequent, multiple times per day) needs whatever version is in there is plenty.
""" Subscribe
$1, $4, $10 or $50 per month ... """
""" Single Payment
If you choose to pay less than US$45 ... """
""" Free/Demo Version
Periodically goes silent after 10 minutes.
No access to nightly (development) builds. """
And, if you wonder, you can't enter 0 for the payment.