Apk file troubles

[Android Central Question]

Why can't I download a apk file from of whatsApp, it is saying unable to view properties of this app. I had also downloaded astro file but I not getting it. Please help.

 

[belodion]

Enable Download From Unknown Sources in Settings, Security.

 

[B. Diddy]

Welcome to Android Central! Are you saying you're trying to download an apk file of the WhatsApp app so that you can install WhatsApp? Or are you saying that someone attached an apk file to a WhatsApp message, and you're trying to download and open it?