From NIS to NS

Hi,

A few questions if I may... I should add a few months down the line from my last posts all my PCs are now at Windows 10 (apart from Old Faithful on XP) and so far so good.

In a few weeks my NIS licence (on three computers) will expire. I have an open NS licence (for five but currently only on one computer).

Given NIS and NS are at the same version and seem identical bar the word "Internet" on the screens do I really have to download NS and/or uninstall NIS to do this, I can't just rattle in my new licence key as before?

Second question. A device on the NS licence has the same name as one on the NIS. If the NIS device is converted to NS will Norton handle that or will two devices with the same name on the same licence make it go boom?

Third question. Amazon has a total bargain just now on a 10 users NS with Backup licence. How does the with Backup bit alter the product as I probably wouldn't use that? i.e. can you just use it without the Backup bit.

Many thanks,

David