If you use the Online version you will need to use Premier or the Self Employed version. If you buy the CD/Download program you can buy any version. All the Desktop programs have the same forms, you just get more help in the higher versions.
The CD/Download Desktop you buy and install the program, which can do unlimited returns. The returns are only saved on your computer and can not be accessed from anywhere else. And not saved at Turbo Tax. So Be sure to save Frequently and make backups. You get 5 federal efile for free, the rest you can mail. In Deluxe and above you get 1 state PROGRAM download to prepare unlimited state returns (in that state). Each state return including the first one is $20 early or $25 to efile or you can print and mail the state for free. The Desktop programs do not have the expert help that is available to add to Online versions.
Desktop also has many other features and advantages over the Online version. You can do more than 1 return. You can see and enter into the actual forms. It has a What-If worksheet. And the Desktop program is always available even after the year ends. Which is good if you ever need to amend your return after online website is closed or get audited and need your tax records.
You can buy the personal Desktop CD/Download program here,
https://turbotax.intuit.com/personal-taxes/cd-download
Window System Requirements
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
Mac System Requirements
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
