How to fix "There is a problem parsing the package" when sideloading WhatsApp?

I downloaded the apk from [here](https://www.whatsapp.com/android/) 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.