I want to purchase additional 2017 Standard returns

[xmasbaby0]

"Standard"?  Are you in Canada?
CANADA  This is the U.S. TurboTax AnswerXchange. For help with Canadian taxes, please post your question in the Canada TurboTax AnswerXchange, at the following link.
<a rel="nofollow" target="_blank" href="https://turbotax.community.intuit.ca/tax-help">https://turbotax.community.intuit.ca/tax-help</a>  

[Hal_Al]

If you bought the (USA) 2017 TurboTax  Download (not online) software, you may do an unlimited number of tax returns.  No additional purchase is required. They have to be printed and mailed. You can no longer e-file a 2017 tax return.

2017 online software is no longer available, at all.

To purchase 2017 (or earlier) download (desktop) software, see https://turbotax.intuit.com/personal-taxes/past-years-products/

[VolvoGirl]

Standard is a Canada version.