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I am trying to upgrade my version of Wordpress but I get this error:

Destination directory for file streaming does not exist or is not writable.

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up vote 0 down vote accepted

This is a read-write permission error. Fix this by changing the "wp-content" folder's permissions to 755.

If this doesn't work checked the wp-config.php file and if it's not already defined, add

define('WP_TEMP_DIR', ABSPATH . 'wp-content/');

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