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It seems that you're trying to install the whole package of the Otello theme, but you need to install only the otello.zip folder into WordPress, not the whole archive.
Please take a look at the following article for more.
Hello,
I come across this error when uploading my theme:
The package could not be installed. The theme is missing the style.css stylesheet.
Theme installation failed.
Hi Georgina,
It seems that you're trying to install the whole package of the Otello theme, but you need to install only the otello.zip folder into WordPress, not the whole archive.
Please take a look at the following article for more.
- https://help.market.envato.com/hc/en-us/articles/202821510-Theme-is-missing-the-style-css-stylesheet-error
Feel free to ask for anything you need.
Kind Regards