The hashing license comes with the product when you buy Poke Farmer. Only with Ninjabot do you buy it separately.
In pokefarmer setting under captcha you can fill in the serial. Why is that then? I thought you need to buy both (wich i did)
That's for the Automatic solving if a Capthca appears (IF!) For this you need a seperate license from 2Captcha website. This has nothing to do with PokeFarmer or it's license. PokeFarmer just provides access to the service from 2captcha website (and yes it's a paid service from 2captcha) in it's bot to autosolve the captcha, that's all.