How can I get refund for 2018 Deluxe version ($44.99) because I meant to purchase Idaho state tax and I already purchased 2018 Premier through Costco? Please advise.

I did purchased Turbo Tax 2018 Premier from Costco and I need additional State Idaho tax so I tried to purchase it through online.  However, I accidentally purchased and paid for 2018 deluxe version which I don't needed.  Also I did purchased Idaho state tax and paid for it.  Please advise how can I get refund for for version of Turbo Tax 2018 deluxe ($44.99).