sorry, a bit off topic.
what software was she trying to install on this system?
i have an M1 iMac, if there are apps requiring intel-based system, M1 devices will have an emulator (Rosetta) running to run these intel-based app.

here's mine in comparison for Universal > M1 > Intel Based apps.
i think universal apps were built adaptable to different OSs? just sharing! good luck w the selling if she's selling it anyway.