Here is a simpler approach, we recommend our customers to use.
- Zip the files.
 - Upload the zipped/compressed file via FTP.
 - Login to cPanel account at http://{ip}/cpanel or http://yoursite.com/cpanel.
 - Click "File Manager" under Files column.
 - Select appropriate directory to open.
 - Find your file and click on its name.
 - Click "Extract" button.
 
It is recommended that you upload and uncompress the file in an empty directory/folder to avoid it from messing up with your existing files.
