There is a new version of the 1.10 series, specifically the stable 1.10.1 Security Update. You can get this version via github or at http://osticket.com/download. It features some improvements/bug fixes, and an important security update. Here is a list of the changes:
This article was updated on 08 Mar 2017
Generally speaking many of the previous FAQ answers [for former versions of osTicket] some times still apply to the current version. The line numbers will be wrong, but the information is usually still good. If you do not see an answer to your question please check out the older versions of this FAQ and/or post on the osTicket forums.
So you're running osTicket version 1.9.x and you want to upgrade it to current which as of this writing is 1.10, and you need a little help. Well, you've come to the right place. One very important thing to note: contrary to what the osTicket FAQ at http://osticket.com/faq says, you need a newer version of PHP than 5.3. I would recommend PHP 5.5 or 5.6 over any other versions at this time. So if you have 5.3 go upgrade to 5.5 of 5.6.