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We are assuming you are familiar with your website's file location, here is a link to an article that explains the directory structure in deeper detail
- Backup your Joomla website.
- Using FTP or File manager navigate to the existing validate.js file located here:
- Rename the existing validate.js something like:
- Download the corrected validate.js file from github.
Here is a link to the full download page:
- Extract the downloaded file and upload to:
- Now, clear your browser cache, then log back into the Joomla! Admin panel.