WordPress Speed Up Service | WordPress Website Maintenance Packages Reply To: How to revert back to a previous version of a theme?, by Drew Westcott Hi pmaptechie, When you say you have the CSS, do you mean you have an older version of the file? Do you have access to the FTP details for your hosting, as this is probably the quickest way to upload the older version of the CSS file. I’d suggest making a backup of the theme folder on your FTP directory first. Let me know if you have any further details on your set up. Drew Reply To: How to revert back to a previous version of a theme?