Coursepress Pro - why is it not an add on with the affilaites plug in?

Hallo I am have trouble to install the Coursepress pro plug in but I have logged another ticket for that.
My question for this ticket is:
Coursepress Pro - why is it not an add on with the affiliates plug in?

I am building a training website which will be duplicated for many re sellers, giving each of them their own website to sell training courses and I want to use the affiliates plugin to manage the payments to the affiliates. But I dont see that it is listed as one for the add ons that can be activated under the affiliates ad on.

Thx