Can cofirm that too. The update fixed the problem. Thanks for your swift reaction!
Apologies if it is frowned upon to revive an old thread, but I'm getting the same issue now as well. BTT is showing up as deactivated, though I have 32 days of my trial still remaining.
Versions: Macbook Pro M1 (2020), Big Sur 11.5, BTT 3.570.
This is still an issue in August 2022 with version 3.837. I'm pretty sure I still days left on my trial. But it started giving this strange message after I upgraded to the latest version. I thought the latest BTT version had a bug. So I downloaded a few other versions, looking for a working one. Finally found this thread.
This makes more sense. A bad error message + bad dates. After I registered my version 3, it works fine again! Yay!
Definitely worth it to fix this. I want this project to be successful and profitable. I'm afraid this will scare away new users. Thank you for your hard work! This is an amazing app that makes MacOS not just usable but excellent (I may have switched back to Windows by now without this).
Check for updates again, it should be working now.