WordPress blog (yangsoft.com/blog) Update and Plug-in install errors and fixes:

Error 1: when clicking on “WordPress 3.6 is available! Please update now.”:

[Downloading update from http://wordpress.org/wordpress-3.6-new-bundled.zip…

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

Installation Failed]

Fix:

1. Submitted a Support ticket to Winhost and got back a reference link http://forum.winhost.com/threads/wordpress-permissions.10078/
2. Somewhat useful and tried the steps below:

1) Downloaded wp-config.php to local folder; and added this entry to it:
define(‘WP_TEMP_DIR’, ABSPATH . ‘wp-content/’);
2) Uploaded it back to wp root folder.
3) Re-run the Update to version 3.6 and it worked!

3. Then installed Plug-in “wp-DBManager” which wasn’t installed before and now it went through just fine.

It turned out Winhost tech team was pretty decent by forwarding those links from its forum. Thanks!!!