I think I'm having a similar issue. Purchased a new iMac and trying to install '24. I have it installed on my MacBook Air. I think I may have forgotten to unlicense a previous install from an older MacBook Pro, so I unlicensed from the current MacBook Air, and I still get the error message. I've emailed FastSpring a week ago and have not gotten a response.
I've also tried used the reinstall game data from the troubleshooting menu also to no avail.
Hoping for some guidance.
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