As per your output seems like there is no issue with starting the MySQL server.
Can you try starting MySQL from the AMPPS panel and let us know if it has started or if you are facing any issues?
You can also open a ticket for faster resolution of the issue.
It seems like the MySQL port conflict is preventing the upgrade. You can try stopping the older MySQL instance from running through the AMPPS panel and then attempt the upgrade again. If the issue persists, consider opening a ticket.