Go to the site to purchase the download instead of the site for online software.
2021 TURBOTAX
CD/DOWNLOAD (This requires a full PC or Mac—-cannot be used on a mobile device)
https://turbotax.intuit.com/personal-taxes/cd-download/
You can also purchase the CD/download from various retailers such as Costco, Amazon, Walmart, Best Buy, Staples, Sam’s Club, etc. etc. etc.
This link Where can I obtain authentic TurboTax software? has a list of authorized TurboTax resellers.
When you use desktop software, there is an additional fee to e-file a state return. You can avoid that fee if you print, sign and mail the state return. The state e-file fee is $19.99 and increases in March.