Looking for a server key for a Pro demp

Installed Passbolt Pro for my organization in order to do a proof of concept on the solution within our environment. We require an on premise solution so the cloud version will not work. I am up to the point where it is asking me for a server license however, I am not finding anything in regard to license or demo.

Hello @skout.master,

The Pro version requires a subscription key to run.
We will be pleased to talk about your project, email us at sales(at)passbolt(dot)com.

Best regards,