However, if you're reinstalling Office, you've already redeemed a product key, or you're installing Office at If your computer can't install the full desktop version of Office, try the free Office Online apps using your.PUBLISHER FOR MAC SOLUTION. Learn how to install Office 365, Office 2016, or Office 2013 on your PC or Mac. You will need approximately 1.5 GB of free space on your. The file will extract and launch the installer automatically. After download finishes, locate the file and double click on the file. Download the installation file by clicking on the link below, save it to your computer. Includes all new new versions of Word, Excel, and PowerPoint with redesigned Retina-optimized interface.