Update failed: The package could not be installed. PCLZIP_ERR_BAD_FORMAT (-10) :

Hello,

We apologize for the issue you are facing with the plugin update. The error message PCLZIP_ERR_BAD_FORMAT (-10) typically indicates that there is a problem with the zip file being used for the update, which could be due to a corrupted download or an issue with the server’s file handling.

Here are a few steps you can take to resolve this issue:

1. Clear Cache: Clear your browser and site cache to ensure that you’re not loading a cached version of the plugin.

2. Manual Update: You can manually update the plugin by downloading the latest version from the Rank Math website and then uploading it via the WordPress admin panel:

   • Go to Plugins → Add New → Upload Plugin.
   • Choose the downloaded zip file and click Install Now.

3. Check File Permissions: Ensure that your server has the correct file permissions set for the WordPress directories. Typically, directories should be set to 755 and files to 644.

4. Disable Other Plugins: Sometimes, conflicts with other plugins can cause issues. Try deactivating other plugins temporarily and then attempt the update again.

5. Check PHP Version: Ensure that your server is running a supported version of PHP, as outdated versions can lead to various issues. You can find more information on this in our article about PHP compatibility.

If these steps do not resolve the issue, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further. Thank you for raising this concern!

Hello,

Thank you for contacting us and sorry for any inconvenience that might have been caused due to this issue.

This error is usually due to trying to update the Rank Math PRO plugin while connected to a free account. Please follow this guide to fix the issue by connecting to your PRO account:
https://rankmath.com/kb/fix-pclzip-err-bad-format/

Let us know how this goes.

Thank you.