Thanks for the solutions!
Typography and Copyright worked all right for the solution. Successfully I could upgrade them.
However, Background, Colors, Blog, Disable Elements and Hooks don’t work at all.
Now even if I tried to deactivate these add-ons at GeneratePress c-panel ( “Appearance > GeneratePress”), nothing happened: Buttons seem not to work at all.
I’d love to hear more further workaround.
Thanks!