If the Tableau Server is setup on a 10-core (or more) machine, you need an enterprise license of BI Connector Server Edition which will offer you the flexibility to deploy BI Connector on all servers for all your users at an attractive cost.

If you have a department installation (8 CPU core license) of Tableau Server, then you need a 8-core server edition license of BI Connector. There is no restriction on the user count.

If your Tableau Server is licensed based on the number of users (instead of CPU cores), the BI Connector licensing is also based on that user count. Please note that all the Tableau Server users will be counted as BI Connector users.