Thank you very much for the report and I am very sorry about the experience!
I'm wondering if you could let us know the result of the repairing process? Does it help with the issue?
Initially, Archicad 23 was mentioned, but in your latest post, it was about Archicad 24. I'm wondering if the problem happens on both versions? Could you share with us some screenshots to understand exactly what happened with the Schedule add-on?
Looking forward to hearing from you!
Technical Support Engineer