It is already cracked and ready to use after installation. This is the download link to Microsoft Office 2011. According to this document, the product key was mailed to you in a mail with subject 'Microsoft Office for Mac – Order Confirmation'. The whole activation procedure is described in Office for Mac 2011 Activation and Product key Information (via ). Office 2011 requires activation and is tied to your hardware so it might very well be that you need to reactivate Office 2011 after the HD change. After pulling almost all other direct downloads, the Office 2011 downloads are among the few remaining ones. Microsoft hosts secret installation files for Microsoft Office 2011 for Macintosh as well.
I have wasted at least 12 hours of my life trying to get this version installed. The truly terrible issue I had with this program was getting it downloaded from Microsoft's website. This is a review of the Microsoft key card version of Microsoft Office for Mac 2011: Home and Student edition.