Since you now have to log into an Intuit Account all your downloads and licenses are listed there (even if you bought it from somewhere else) so if you need to download to install it again or install on another computer, even on the other operating system (Windows, Mac). And the download will always be up to date with all the updates.
Access your program downloads here
https://shop.turbotax.intuit.com/commerce/account/secure/login.jsp?pagecontext=download