Upgrade a package bought from Costco.com

I bought today Turbo Tax Deluxe for Federal. 
I realize that I should have bought Turrbo Tax for Federal and State. 


Can I upgrade?
If no, can I return the first one and buy the other one? If so can I save the file from first and use in second? 

(Adding a state alone is prompting to add $44.99 when the full state + federal costs $49.99  at Costco)