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It means that you have a tight upload size file limit. If you get this message, try to install the theme via FTP instead of using admin panel. Or ask your hosting company to increase the upload limit.
Unpacking the package... Installing the theme... The package could not be installed. The theme is missing the style.css stylesheet. Theme install failed.
You may have uploaded the wrong zip package to WordPress. Remember, that you need only installable theme file. Please refer to What’s included section of the documentation.
Fatal Error: Maximum Execution Time Exceeded in WordPress
Other similar issues: white screen, empty page content. The problem is related to low PHP configuration limits. The solution is to increase the PHP limits. You can do this on your own, or contact contact your web hosting provider and ask them to increase those limits to a minimum as follows:
memory_limit = 256M upload_max_filesize = 32M post_max_size = 32M max_execution_time = 60
Checking your server configuration
You can verify your PHP configuration limits by installing Query Monitor (free plugin) or just contact your hosting provider and ask them what the current settings are and ask to adjust them if needed.
Once Query Monitor is installed and activated go to your site frontend. Your should see a new item in the admin bar. It may show “Query Monitor” or some networks stats.
In the opened bottom panel double check all the key numbers. If your server has low configuration limits, please contact your hosting provider and ask to increase them. Also you can check your actual PHP version from this panel. More information about recommended PHP limits here.
After resolving issues with PHP limits, you can safely delete Query Monitor as it’s a developer tool and it’s not needed to run and manage your website.