Hello,
We apologize for the issue you are facing. The error you are encountering seems to be related to an API Error: HTTP 400. This error indicates that the server is unable to process your API request due to a client error. Here are some common reasons for this error:
-
Website Under Maintenance: If your website is under maintenance, it cannot be accessed, leading to this error. You can check and switch your website back to normal mode.

-
Check Website Status: Ensure your website is returning a 200 status code. You can check the status of your website here.

-
API Timeout: If your website takes more than 30 seconds to load, it may result in a timeout.
-
API Requests Blocked by Firewall: Sometimes, server security or firewall settings may block our API requests. You may need to whitelist the IP 46.30.211.100
and the user-agent RankMathApi/2.0.2; https://rankmath.com
.
-
Locally Hosted Website: The SEO Analyzer module of Rank Math will only work on a live site that returns a 200 OK status when crawled from an external site.

If you continue to experience issues, 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!
Sources:
Why Am I Getting "API Error: HTTP 400" Error » Rank Math
Hello,
It seems like you purchased the plugin with some other email address because we can only see the Content AI Expert subscription on your account.
Can you please share the email address which you used to purchase the plugin or you can search and forward the receipt from FastSpring.com so we can locate your account?
Back to your issue, one possible reason for this error is trying to update the PRO version of the plugin while connected to your free account.
For more details, you can check this URL:
https://rankmath.com/kb/fix-pclzip-err-bad-format/
Looking forward to helping you.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.