The most common WordPress install issue that can occur with users new to installing WordPress themes is a “Broken theme and/or stylesheets missing” error message being displayed when trying to upload or activate the theme.
This error occurs when the file being uploaded is incorrect. When you download your theme you receive a .zip file preceded with the theme name for example blanco.zip. This file contains multiple files for theme installation, such as documentation, updater plugin, demo content etc.
To install the theme, you need to unpack the file you download, and in the unpacked folder you will see a few folders. From all those files you need the zip file called “theme_name.zip” inside the original zip, where ‘theme_name’ is the actual name of the theme. You must install the “theme_name.zip”.
For example below you can see that I have unzipped the blanco.1.7.2.zip file, inside of this unzipped folder you can find the zip file that you must upload “Blanco.zip”.
Upload Max File Size too large
This occurs when your WordPress has a max media file size upload/or your host has set a max file upload size. If this error occurs you should upload your theme using FTP, you can see how to do so here.