@[deleted] @[deleted]
You can also get it from osTicket.com officially with a little trick ;)
The URL of the official download link contains the version number:
http://osticket.com/sites/default/files/download/osTicket-v1.9.8.1.zip
To get old versions, just replace the version number in the URL:
http://osticket.com/sites/default/files/download/osTicket-v1.9.1.zip
Cheers,
Michael