Kadence – Missing style.css stylesheet error
If you see this error, it's because the wrong folder is being uploaded to the Themes page.
First, you need to unzip the main folder that has UNZIP in the name first (e.g. UNZIP-parker.zip)
Then, inside of this folder, you'll find the theme file that you need to upload (e.g. parker.zip)
The theme file that you need to upload to Appearance > Themes will always be in all lowercase and will look something like parker.zip or hm-parker.zip (except with your theme name)
To unzip on a Mac, double-click the file to unzip it.
To unzip on Windows, double-click the file, select "Extract All," select a folder, and then click "Extract."