Now you can use Whatsapp on your PC via a web-client.
First go here: https://web.whatsapp.com/
Then open whatsapp on your phone, open menu and select "whatsapp web". (if the option is not available then you need to update your whatsapp app to the latest version).
After syncing the QR code, it will let you use whatsapp on your PC.
Please note that you need to have the app running on your phone at all times, otherwise it will not work. It is basically like a remote-desktop connection more than a full-blown app for PC.
I'm sharing here in case someone finds it useful.