Whatsapp on android device: PlayStore error code -11, parsing error when trying manual install if this the completely wrong place for tech support stuff I am sorry and would really appreciate it if someone would point out where to ask this question.
I already tried contacting Whatsapp's customer support, but they were less than helpful so far.
Since I already explained my problem to them, I'm going to post my e-mail exchange so far.

Dear Whatsapp support
Yesterday evening Whatsapp encountered a problem and asked me to
reinstall  the application. Trying to do so, I uninstalled the app via
the PlayStore  and, when trying to reinstall it, encountered error
code -11.  I originally thought this might be a problem with the
PlayStore, but now  I'm not so sure anymore.
Things I've tried so far:

Manually remove all remaining files associated with Whatsapp from my  phone.

Cleared PlayStore data and cache.

Uninstalled and reinstalled all PlayStore updates.

Reset my phone to factory default.

Tried manually installing an older version of Whatsapp.


Lastly I tried to manually install the latest version of Whatsapp.
When I try this I get a parsing
error.  I downloaded the APK twice to make sure the download wasn't
corrupt. This  leads me to believe it might be problem with the APK
and my specific  device, and not the PlayStore.
The device in question is a Samsung I9070 Galaxy S Advance running
android  version 2.3.6.
If you require any more information I gladly provide them.
I apologize for any grammatical errors, English isn't my first
language.
Best regards  Marco

And their less than helpful reply, which is the reason I'm posting here, instead of trying to get help out of a robot, or a person acting like one.

Hi,
Thanks for contacting WhatsApp. Your request has been received.
Please understand that we prioritize reports of issues with the
application and provide a comprehensive FAQ to solve most other
questions.
Based on what you wrote in your message, we think that one of the
following may be helpful for you:
To set WhatsApp to a different language
If you want to change your keyboard language or auto-correct settings
Additionally, if you wish
to change your input language, we recommend using Google's input apps
available in Google Play Store. For all other language related
questions, please check our FAQ  If our FAQ does not help, make sure
to go to our website on your phone's browser to download the latest
version and then reboot your phone.
--  WhatsApp Support Team
Take a look at our FAQ!

So, yeah, this is where I'm at. I really hope you guys are able to help, or at least point me in the right direction.
From my own experience the actual WhatsApp 2.16.382 version is not running anymore on devices with Android version lower than 4.0 (officially 2.1 and 2.2) since they launched the video call feature.

It seems like they have dropped the support for those devices as they did for Windows 7 - 7.5 phones, Symbian S40-S60 and Blackberry OS 7 and lower according to their blog.

You should try version 2.16.225 or 2.16.259 (find the apks) which worked for me.