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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Note that if the temp directory is defined otherwise further down in the wp-config.php file, the later definition must either be changed to the above, or deleted.
This arose in my installation which started as a local Bitnami Wordpress install, but kept the same temp directory (pointing to my C: drive). I had placed the above code at the top of the file, but it was being superceded by the later temp folder definition that I was unaware of.