If you buy this product, you can download it for Windows from this site. If, like me, you have both Windows and Android, this is fine for the first bit. But there is no indication whatsoever of how to install it for Android (and I bet the same is true for Mac!). I have just spent an hour of my life trying to work this out. I bet a good many people just give up.
First, deinstall the free Kaspersky app you already have on your Android device. Because, incredibly, this will conflict with and prevent installation of the thing you just bought. More, you will not be able to enter the activation key you just got into it. You just can't.
Secondly, connect to the internet on your Android device, go to the Kaspersky site, and look for the same product you just bought, the "Kaspersky Internet Security 2014 Multi Device". Currently that is here:
At the bottom of this page are the words "free trial". Click on this. This takes you here:
See the downloads of trial versions at the lower right? Find the "Kaspersky Internet Security for Android (30-day trial)" and click on the "Download Trial" button.
A .apk file will now download. Now find this on your Android device, and install it. And ... at some point ... you will get prompted to enter an activation code. Now enter the code that Amazon gave you, the 4 groups of 5 letters and ... it will activate.
I suspect Mac users will have to do the same, to get their software.
* If you try to download from the link you get when you buy, it will ONLY work on Windows.
* If you even try to find "Your software library" on the Android app, you will struggle. And it will only give you the huge Windows exe.
This is pretty bad stuff. Come on, Amazon: you should give all three links, not just the Windows one!