Unable to upgrade Whatsapp? [Closed]

Registration date
Thursday September 26, 2013
Last seen
September 26, 2013
I want to upgrade my whatsapp as it says old version.

My Phone is Nokia E63

I have 107mb of free phone memory

When I try to install error message appears asking me to clear some phone memory.

I have deleted all my SMS messages?

I have seen one unusual thing when I keep Pressing HOME button running in background apps appear there is one Icon saying " Installer" every time I startup.

Things that I have already tried is Normal Reset.

I think problem is with RAM as. Have ample free space in Phone Memory