How to fix "There is a problem parsing the package" when sideloading WhatsApp? I downloaded the apk from here with  WhatsApp version 2.17.106 (size 34601974 bytes).
There, it says: "Android OS 2.3.3 or above". I can extract the APK's contents without errors, so the file is not broken.  

My old smartphone model is GT-S6102, a Samsung Galaxy Duos, running Android 2.3.6.  

I have enabled "Install from unknown sources" and "USB debugging".  I have let Lookout scan it before installing.  

When trying to install that APK using the file manager, I get this message: 


  There is a problem parsing the package


I am also unable to install it from Google Play Store. From Google Play, it says "Package file is invalid".

Update: version 2.17.350 does not work again.
File from https://www.whatsapp.com/android/  version 2.17.251 has minSdkVersion="15"  which means that it supports android 4.0 and later.
Declaration "Android OS 2.3.3 or above" is on the same place.

Ask support?