I do have caching and didn’t disable it. And I didn’t disable all of my plugins. I don’t think these are causing the issue, but if you think I might be wrong about that, let me know and I’ll do the work.
When I try to install from the zip file it says:
Installing Theme from uploaded file: gp-premium-1.10.0.zip
Unpacking the package…
Installing the theme…
The package could not be installed. The theme is missing the style.css stylesheet.
Theme installation failed.