There has been a critical error on your website.
Comments
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I faced this problem after the WP upgrade page timed out.
so used the following instructions to resolve itEnabled debug to identify which plugin was causing the problem (in my case it was WP)
https://profreehost.com/support/common-errors-and-issues/http-internal-server-error-500
General instruction to install such scripts manually
& Detailed WP plugin's manual installation page
Good luck!