A common issue that can occur when installing a WordPress themes is “The package could not be installed. The theme is missing the style.css stylesheet.” error message being displayed when uploading or activating the theme.
The main reason of this error is if you are trying to upload the wrong file. If you download All files & documentation, you have to unzip folder and upload betheme.zip file only. You can also download Installable WordPress file only instead.
Notice!Please make sure you are uploading installable file, which is called betheme.zip ONLY. Otherwise, you will receive an error.