I do my work in chrome (Now Brave!), and then check the site and download in safari and chrome incognito. I am sure I am not lot logged
in as an admin at the time.

Additionally, I use my wife's computer to check functionality (with and without free codes). never logged into the wordpress from her
computer before.

At first, the cache program was preventing you from clicking the button. I went ahead and disabled all my caches and also re-upped the
code for you (set for once per customer).

I actually found that wordpress had a cache system that I did not know was active. Additionally, I had added a cache plugin. Maybe they were causing some weird interactions?

which download link was expired? I got an email saying that your code went through. was it that link?

Let me know if the site is way slow. It is not for me and if you can now download stuff, then I think I might not leave them off! Haha