You can easily download whatsapp for window but first is important to download whatsapp for your smartphone then you can use whatsapp in window. Because window based whatsup is used same number which is working on your smartphone.
You can easily download from the web browser for any window version.
Whatsapp PC installer has gained popularity on internet in past few months; those who wish to use whatsapp on pc for free can download an android emulator that allows you to use any android app on your laptop or computer. The android emulator is developed by Bluestacks that helps you to download and install whatsapp for PC free of cost.