Try Costco first, since that may be the easiest, but they might not do it. Some users have had luck with Costco, while some haven't. Tell Costco you don't have a computer to install it on.
If Costco will not refund it, you can get a refund directly from TurboTax with the online submission form.
Scroll way down in the FAQ to the interface for the online refund request form.
FAQ: How do I request a refund for my TurboTax product?
https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-refunds/request-refund-turbotax-p...
