The most likely cause for this is corrupted file format caused from a connection problem or unzipping the theme/plugin zip file. 

Downloading and installing the theme/plugin zip file again should resolve the problem. 

Make sure when you download the theme/plugin, it remains as zip file on your system, any other file format than zip will show cause this error when installing.

Note: If you are using a Mac with Safari, your zip files will automatically be unzipped. You will need to adjust your Safari Preferences below:

  1. Open Safari 
  2. Click Preferences
  3. Under the General tab, uncheck the option Open “safe” files after downloading
  4. Download the file again. 
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