Yes, you can download TurboTax (for Windows) for current and prior years. Download the CD edition of TurboTax for the tax year you need.
You need a 16-digit licence code (previously known as an installation key) to install and run your download of TurboTax.
Note: Online editions of TurboTax run in your web browser. There's nothing to download or install on your computer if you’re using TurboTax Online.