Hi Bill,
With regard to your case # 27751125, I would like to update that I have documented your issue and have escalated to a senior expert to review and suggest on the error message while upgrading the package in the sandbox.
I was able to reproduce the same issue while upgrading in your sandbox.
I will keep you posted as soon as I have new update for you. My next follow up will be tomorrow in between 12:00 pm to 2:00 pm EST.
Thank you
Gaurav R Jaiswal
Senior Support Engineer
Salesforce Technical Support
Global Customer Success Centers
