Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience caused.
This error is usually caused when you’re updating the PRO plugin but it is not yet connected to your Rank Math account.
You have opened this ticket with a Free Rank Math account.
Can you please share the email you used to purchase the PRO subscription?
To fix the issue, head over to your WordPress admin area > Rank Math > Dashboard > Help, disconnect and reconnect your Rank Math account.
Once done, update the plugin to its latest version.
Here is a guide for your reference:
https://rankmath.com/kb/fix-pclzip-err-bad-format/
Hope that helps.
Thank you.
Hello,
We are super happy that this resolved your issue.
If you have any questions in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.