The form 3115 is only available in the TurboTax desktop version (CD version). You can't link to the desktop version, you need to download it, install it, and open it. The link you found was supposed to take you to the https://turbotax.intuit.com/ page where you can find a CD version. At that website use the Products and Pricing Tab to find information on CD/download products.
When you buy the CD version you don't need to also buy the online version. You can efile using the CD version. BUT you can't efile if you include a form 3115. You'll need to paper file.
