See the instructions in the TurboTax FAQ I'm linking below. This should help you out.
You can download your software directly from TurboTax.
If you need help installing, we can help with Windows and Mac.
Why did you purchase a CD version when you didn't have a CD drive? The best thing for you to do is go back to Staples and purchase a CD drive or get one from Amazon or Walmart. If you use the online version you'll have to pay again unless you qualify for a free version.
Yes, you can download the Desktop version by visiting this link InstallTurboTax.com