As the title states, I had to download the latest version of Security Suite in order for it to install correctly on Vista home premium 64 bit o/s. After doing so and configuring the product, I tried to enter the so far never used product validation key supplied with the store bought copy. It came back as "invalid activation key", after double checking and re-entering the key code. When I downloaded the update, I ran it directly from the download as I trusted ZA to be safe. There was no updated activation key included in the download so I (apparently) assumed incorrectly that my store bought code on the CD sleeve was enough. I also tried entering the code into the proper field inside the ZA security center after setting everything up- same result- key is listed as invalid. HELP.