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Had a hell of a day today. Do not upgrade to 6.4, it breaks PHP cURL and you can no longer install/update themes and plugins.
WordPress core team are aware and currently awaiting a fix.
Further info:
If you have already updated to 6.4, revert it back to 6.3 (otherwise you won’t be able to do auto update from within the site) and ensure you disable core updates in wp-config.php, and then sit and wait for 6.4.1
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