Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Orla,
Office Professional 2013 is a Windows based software and cannot be installed on a Mac.
To install Microsoft Office on Mac, you need to have an Office 365 subscription or buy a version of Microsoft Office that supports Mac Operating System. For more information on the same, refer to the following link.
http://www.microsoft.com/mac/buy
I hope the above information helps.
Thank you.