osTicket 1.18.2 has been released with OAuth2 improvements.
Improvements
The old branch (1.17) has also received a maintenance release v 1.17.6 with a hefty list of improvements.
You can read the release notes here: https://github.com/osTicket/osTicket/releases/tag/v1.17.6
Always utilize the official download site osticket.com/download to download releases, language packs, and plugins.