Install Norton 360 using original key and serial number

Norton Security | Norton Internet Security
1

I have a multi pc account and i have lost my old install files can any one tell me where I can down load norton files to install and use my old key and serial no.

 

[edit: Clarified subject.]

2

I have a multi pc account and i have lost my old install files can any one tell me where I can down load norton files to install and use my old key and serial no.

 

[edit: Clarified subject.]