https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...
This link advises paying for the desktop software. I already paid for the 2018 online filing. My question was how can I download the 2018 TurboTax Desktop for free because I already paid $190 to file online for 2018.
