You can purchase the software as a CD or as a download. 

To purchase the download version, please visit https://turbotax.intuit.com/personal-taxes/cd-download/ to see a listing of all of the downloadable products.  The page provides a comparison of all the available products. 

You can view each individually product more fully by clicking Learn More at the bottom of each column. 

You can make your purchase by clicking the Buy Now button.

After you've purchased a downloadable product through TurboTax.com, you can download it whenever you like up to 3 years after purchase.

1. Sign in to My Downloads.
2. Click the blue Download arrow for the product you would like to download.
3. Save the download somewhere on your computer where you can find it – your desktop is a good place.
4. After the download has finished, install your software by double-clicking the downloaded file.

For more details, please see the following FAQ:

https://ttlc.intuit.com/replies/3302070

Yes offline to prepare taxes

You can buy the CD Desktop program or download the program.  You can buy it in stores or from Turbo Tax.   But you will need to go online to update the program frequently and before you file.  You will need to go online to efile the return or you can print and mail it.  

 

You can buy the CD or Download here,

https://turbotax.intuit.com/personal-taxes/cd-download/ 

 

If you don't want to go online at all you can fill out the blank forms by hand.  

What if I have already purchased and downloaded the software and it still won't work offline?  Is there a setting somewhere that I can set to stop trying to connect to the internet?

Yes.  For Windows go up To Online - Updater Preferences

 

Don't know Mac.