Thread is really old (2016).
Looks like it is available here: http://osticketapp.com/
(which I found by looking at this thread)
I do not recommend using it though since it is for an old version of osTicket which support for is likely to be ending soon, and to me it looks like it might be abandoned since there have been six releases since 1.10 came out. (security releases 1.10.1, 1.10.2, 1.10.3, 1.10.4, 1.10.5, and major version 1.11.0)
Killing zombie thread with a head shot.