Understand that you flat out can not use the online version to file a prior year tax return. You will have to purchase the CD version and physically install it on your Windows or Mac computer. Additionally, you can not e-file a prior year tax return. The IRS says so. You will have to print it, sign it, and mail it to the IRS.
To get TurboTax 2017 you can go to https://turbotax.intuit.com/personal-taxes/past-years-products/ and purchase the CD version of TurboTax 2017 there.
MAKE SURE YOU ARE UNDER THE RIGHT TAB FOR THE TAX YEAR YOU NEED.
If you purchase the CD version for 2018 by mistake, then you own it. Also make sure you purchase the correct version for your specific operating system. If you own a MAC, and you purchase the Windows version, you own it.
After you pay for the program, you will be able to download the CD installation file and install it immediately, so you don't have to wait for delivery of a physical CD.
If you have questions in the process of preparing your 2017 tax return, make absolutely certain that in any posts you make in this forum that you "CLEARLY" indicate you are working on a 2017 tax return. This is because tax law changed "DRASTICALLY" in 2018, and those changes WILL NOT apply to a 2017 tax return.
