Which type of Orchestrator did you purchase? Cloud version or On-premise version?
If it’s on-premise, you need to install the Orchestrator & active license follow below guideline
In case of cloud, Please refer below page
I think you need contact to UiPath to upgrade your cloud Orchestrator.
Note that you can’t request additional licenses while on this plan. Request the Enterprise Trial plan or contact us to upgrade your plan to Enterprise.
And please be noticed that,
UiPath maintains separate Cloud Orchestrator instances for Community and Enterprise customers. Upon upgrading to the Enterprise Trial or Enterprise plan, any pre-existing Orchestrator services stay on the Community free instances. However, they receive all the benefits of the Enterprise plan, with Enterprise licenses. Any new Orchestrator services created after the upgrade are hosted within the Enterprise paid instances.
At the moment we don’t have an automated migration mechanism in place for Orchestrator services. If you wish, you can re-create the Orchestrator services, knowing that they are hosted within the Enterprise paid instances.
So you should consider to upgrade your existing community instance or create new Enterprise instance