On Android 6.0.1, go to Settings > Security and toggle on "Unknown Sources" to allow the installation of apps from outside the Play Store.
For the safest experience, always use official or verified channels to avoid security risks: download whatsapp for android 601 exclusive
: If the Play Store is unavailable, reputable sites like APKMirror offer archived versions such as 2.12.401 , which was specifically optimized for Marshmallow's launch. On Android 6
This is the safest and most reliable way to get the latest official version with automatic updates. On Android 6.0.1
Since the Play Store hides incompatible apps, you must manually install the APK.
