Hello,
the process describe by vanepp works, but that is not how it is supposed to be.
After the payment, you are redirected back to the download page, and can choose which version of Fritzing you want, include very old versions like the 0.9.3b version for 32bit systems. No login or similar needed.
It seems an increasing number of people see the issue that they are indeed forwarded to the download page, and although the server at that moment registers a successfull transaction (payment made, user arrived back at download page), the page itself looks as before, with the payment button.
I could not yet reproduce this on any of my systems (linux, windows, mac, safari, firefox, chrome…) . I don’t want to invest to much time on hunting that issue down, most time I currently spend on rewriting the complete page on a new technology stack. But still it would be great to know what is causing this.