The Business Edition you were given is a more expensive product than the Home and Business Edition. I suspect that once you explain it to Costco, they will correct it and provide you the correct product.
If they won't, here's how to reach TurboTax Support, and hopefully they will provide you a download of the Home and Business product.
You can use the form at the link below to schedule a call back, or it may provide a number. Hours are 5AM-9PM Pacific (8AM-12 Midnight Eastern) 7 days/week.
Where the form asks what product you are using, be sure in the dropdown menu to indicate "CD/download" and the proper operating system, then indicate which Edition.
https://support.turbotax.intuit.com/contact
