- Best Answerset by KevinTheJedi
As the error states you need to upgrade PHP to at least 8.1. osTicket v1.18 supports PHP 8.1-8.2 as described in our requirements:
- https://github.com/osTicket/osTicket#readme
- https://osticket.com/download/
- https://docs.osticket.com/en/latest/Getting%20Started/Installation.html#prerequisites
Cheers.