Hi I get a similar error.. using the Admin screen (like I have for the last few years), but the error on the Plugins page is:
Update Failed: Download failed. Bad Request
Is it possible that my Activation Key has expired? Can I send this to you (Support) privately to check its validity? TIA Gary
Ack.. nvr mind.. I see now that it’s the ‘update a page/post’ that is failing for you.. not the update.. please ignore.
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Hmmm, which classic editor plugin? https://wordpress.org/plugins/classic-editor/ ?
I tried that but still get the error when trying to upgrade from 5.7.10 to 5.7.13..
TIA
gary