Convert NIS key to NS key?

Hello.

A few days ago my friend gave me NIS key as christmas gift.

He told me that the NIS key can be "transfered/converted" into NS key with the help of Norton Support live chat.

I did the chat with the staff.

But he told me that NIS key can't be changed to install NS key.

And he told that NIS key can only be used to extend NS subcription.

So i must buy NS first.

But i only have 3 PC on my home and NS have 5 device availability so i'm just about wasting 2 device, thats NOT my option.

Anyone having the same problem with me?

Why NIS subscription can't activate/install NS?

Please share your opinion.

 

Regards.

Bread.