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Download failed.: SSL certificate problem, verify that the CA cert is OK

Follow the simple steps to recover from the above wordpress upgrade error step 1 .Create a folder, which may be missing: /wp-content/mu-plugins step 2. Create a php file inside that folder and name upgrade_fix.php put the following code into the php file and save add_filter('https_ssl_verify', '__return_false'); add_filter('https_local_ssl_verify', '__return_false'); step3. Go directly and run the network upgrade again, the issue should be solved.

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