Have Norton Security Premium 2016--Prefer Norton Security Standard 2017

Currently have Nort Sec Premium 2016 installed on my computer. Turned off auto renewal. Subscription expires 9/3/17. How do I download Nort Sec Standard 2017 with premium (2016) already installed?

Will premium (2016) be completely uninstalled before standard (2017) is downloaded? Will my protection continue during this transition? Or, must I use Add/Remove programs (Windows 8.1) to delete premium (2016) manually? In my email from Norton, is a link to end my subscription to premium (2016). Will clicking on this, turn-off a software switch, or uninstall premium (2016)?

I am very grateful to any who can assist with these issues.

[Note: I have reviewed carefully the new features associated with the latest premium. Some, like Identity Theft (Lifelock) are duplicated in other services that I have already.]