Refer the below link of tableau pricing:
You need to go for one Creator and one Explorer or Viewer.
See a full comparison table for more information.
Thanks for your answer.
However it looks like you need to purchase a minimum of 100 licenses for Viewer or a minimum of 5 explorer!!
I only need 1 creator and 1 viewer...
One creator will work in two machines and buy one online license.
That what I thought... unfortunately, the new offering does NOT allow to buy only 1 Explorer or Online license. 5 is the minimum number... even if you don't have a need for it.