If you already purchased the CD, you can contact TurboTax support, they can push you a download of your software.

What is the TurboTax phone number?

https://ttlc.intuit.com/replies/3300041

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If you have not purchased the Desktop software yet, you can from TurboTax.

To purchase the Desktop version by CD or Download, click on the following link, click on the Buy Now button under the version you want, on the Download TurboTax Now screen choose PC/Windows or Macintosh, (if you want to order the CD click on the blue link I'd link to order a CD instead)

https://turbotax.intuit.com/personal-taxes/?view=desktop