Webroot installation is not a big deal if you follow the right procedure. Like every other antivirus Webroot also needed a valid Keycode or activation code. This Keycode or activation code requires to activate your subscription at the time of Webroot install. Without a valid keycode, you are not able to download and install Webroot on your computer. One more thing is very important in order to install and use Webroot on your computer. Your computer must fulfill the minimum system requirement for webroot.
Bellow are some interesting links for you! Enjoy your stay :)