You are downloading the WhatsApp XAP file v2.17.306.0 for Windows Phone. WhatsApp is a free and useful Social app: WhatsApp Messenger is a FREE messaging app available for Windows Phone and other smartphones. WhatsApp uses your phone's Internet connection ... You can now download the offline XAP file to install & try it.
Download Locations for WhatsApp 2.17.306.0 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline WhatsApp XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.