To claim the solar credit, please follow these steps:

• In TurboTax, open your tax return
• Click on Federal in the left-hand column, then on Deductions & Credits on top of the screen
• Scroll down to All Tax breaks, locate the section Your Home and click on Show more
• Click Start next to Home Energy Credits
• Follow the interview to enter your information.

Which Tubro Tax do I need to claim my solar installation credit?

Deluxe or better  if you use online TurboTax  or you can use ANY  version of desktop software that you download/install from a CD...  Basic if you don't need a state return and Deluxe or better if you do.  

Now if you wait until the IRS FREE FILE opens in mid to late January and your income is below the max allowed ( last year it was $72K ) then you can file for free ...    https://www.irs.gov/filing/free-file-do-your-federal-taxes-for-free

ONLINE 

https://turbotax.intuit.com/personal-taxes/online/

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.

https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...