I am having the same problem as above. I cannot activate Superfly because it asks for a purchase code, instead of saying "your copy of Superfly is validated with your X theme" as in the linked Extension - Superfly page.
I am using pro version 1.2.7 (my site auto-updated). When I click "install superfly" it installs superfly version 4.3.3. That said, I see that your last supported version of superfly is 4.3.2 as listed here https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195
So I am guessing my issue is that I need to have the older version of Superfly for the plugin to work. But how can I obtain the older version? The Pro theme installs the newer version.
I also tried entering my name and email without entering the code, and clicking submit, but it did not result in Superfly activation.