So I assume you used the Online version? Can you find another computer to install it on? Like a family member or friend? Sorry you can’t apply the Download purchase to the Online version. You will have to get a refund and pay for online separately.
You can use this online refund request form
https://ttlc.intuit.com/community/tax-topics/help/how-do-i-request-a-refund-for-my-turbotax-product/...
