Ok...
So 2 possibilities here.
1. ) It is a permission issue
2. ) You somehow got an old copy of my code before i fixed it... Re-download the .zip File and try to Recopy & Paste it to your root osTicket Folder.
There was an error in the original code of class.config.php that bkonia posted that I had to fix in the update. Verify that Line 733 is as follows:
.',html_email_template='.db_input($vars) // BSK Update HTML email template
^^Broken code was $VAR instead of $VARS
Cheers~