I bought the CD version for ease of loading, but decided to follow the 'recommended' route of downloading from the website - mistake! I had one day of Norton 360 left, which seemed to confuse the download and produced error message. Considering the product is by the same company, I would have expected it just to tag on after the 360 expired, as has been the case with previous Norton products, but no. It took forever to download, the 360 had to be removed, then error messages appeared and another process had to be followed. At one point, warning messages kept popping up, indicating that the firewall was off and that there was zero protection for anything.
It appears to be working now, but a less experienced internet/computer user might well have given up and called an engineer out at great expense. It just shouldn't be that difficult!
USE THE CD to load this product or expect a great deal of hassle. If I wanted that, I'd have gone back to the product beginning with Mac!