Can not install Mac Office 2011

I have paid to have 3 months subscription. Now, trying to download Microsoft office 2011. Download is done however installation is not happening. This is the error message coming " Office 2011 14.4.3 Update cant be installed on this disk. A version of the software required to install this update was not found on this volume". Please help

Screen shot of the problem message is attached.

You actually running the 14.4.3 update package instead of installing the main office 2011. That is the reason.