Did you purchase desktop Premier at Costco and then discover you did not need it? Did you manage to use the online Free Edition instead? Did you e-file successfully? Was your return accepted?
If the Free Edition was adequate for you then seek a refund for the software you bought at Costco.
To request a refund for a TT product
https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-refunds/request-refund-turbotax-p...
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**