At the bottom of the humble page when you click on ‘Stonehearth’ there is a link that says “Stonehearth gift key” with the key below - send this to your friend to redeem and they will have access to the second beta.
Cool Thank you very much
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No worries!
Let us know if you’re having difficulty 
as @Geoffers747 pointed out, the extra key should be available, and what you provide for your friend… however, should the need arise, you can in fact use your own key more than once… installing on a second machine at home, etc.