Horizons Question about Horizons and Steam.

I originally bought this game from Frontier, and then when they gave me a Steam code I activated that code on my Steam account, and I do launch this game from Steam. If I buy the Horizon's from Frontier, do I get a Steam code for it? If I do not get a Steam code, will Steam still download/update the content related to Horizons to my Steam version? or do I have to buy Horizons from Steam?

thank you.
 
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