A common 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 message does not mean that the theme you have purchased is broken, it simply means it has been uploaded incorrectly. Luckily, there is a very easy fix. Please follow the steps below to rectify this issue or watch the screencast.
Download the final zip file from your downloads page.
Unzip the final zip file; you should now have a final download folder.
Do NOT upload the final download folder. Open up the final download folder.
Browse the contents and find the actual theme folder. If you look inside the theme folder, you will see a style.css file. This is how you know you have found the theme folder.
Using an FTP client, upload ONLY the theme folder to your wp-content/themes folder.
Login to your WordPress admin panel and activate the theme.