Trouble installing temporary student license

One of my students has trouble installing the temporary student license we purchased for Glyphs 3. She writes:

Bei mir funktioniert die Lizenz leider nicht. Die sei angeblich veraltet, wird angezeigt. Ich habe den Mac neugestartet, die Lizenz aus verschiedenen Ordnern benutzt und Glyphs 3 mehrmals neuinstalliert, wie es auf der Webseite empfohlen wird… leider ohne Erfolg.

System: MacOs Big Sur, Version 11.2.3, MacBook Pro (Retina, 13 Zoll, Early 2015)
Fehlermeldung Glyphs 3 Lizenz

Is this a known issue? Can you help? A colleague of mine tested the same temporary license and at his place everything seemed to work fine.

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Installing a valid temporary license (typical for classes or workshops) may yield the following error message:

Register Glyphs 3
The license expired.
Please obtain a new license.
Glyphs will run in Demo Mode.

…even though the date on the license has not been passed yet.

This is a rare issue, and I am sad to say we have not been able to pin it down yet. Somehow the date comparison fails under certain, rare, circumstances. So far, all I can say is:

  • only Macs with Big Sur are affected,
  • it always works in a separate user (create a new one in System Preferences > Users),
  • at least once, removing system maintenance utilities (antivirus software, ‘cleaners’, monitoring tools) seems to have been related.

Potentially related:

We have received one report about this issue appearing in Monterey as well.

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…and I can now confirm that, at least in one instance, it has occurred on macOS 10.15 Catalina as well.