Please follow the instructions in this document to install Norton 360 on an additional computer:
I bought the download version, and had to download N360 onto all 4 systems. (I bought a 5-license one.) Then I installed it onto each one, grabbed (copy/paste) the CD key/registration off my account on the web, and everything worked as expected.
Visitor informs this:
Just one small suggestion: Download could be performed one time on one machine, copied to a flash drive, and this copied file could be brought to the other three machines to perform the installation. This would save on time waiting for downloads.
There are currently 4 users online.