kellyho67

I have the same issue.. getting same message and the /tmp directory is being shown for mine Download failed. Could not open handle for fopen() to /tmp

Use this patch in your file.php for wp-admin/includes and it will resolve this issue of having too long of a file name https://core.trac.wordpress.org/attachment/ticket/34938/wp_tempnam-too-long-file-name.patch