If you already paid for the desktop version for 2019, the only way to get the online version free would be to talk to customer service to see if they will allow that. If you purchased the desktop version from a retailer, you probably won't be able to do it, since there will be no way of verifying the purchase.
You can reach TurboTax as follows:
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
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