osTicket has never really had much in the way of reporting. The Dashboard is all it has. There were some minor tweaks to the Dashboard in 1.10 and 1.11 [mostly to make it work with the new database formatting]. I do not believe that it lost any functionality in those intervening versions.
You best bet is to clone your live site and upgrade the clone. Make sure that it suits your needs and the upgrade goes smoothly.
Where I work we use paid Reporting Plugin from software-mods for our reporting needs.