1 Sign in. Go to https://microsoft.com and click on Sign in. 2 Sign in or create a new account. 3 Click on your profile picture and on 'view Microsoft account'. 4 Click on Services & Subscription. 5 Click on install Office. 6 Click on install. 7 Start installation. Select the option 'continue' on the first installation screen to start the installation process. 8 Fill in your Mac-password to sign-in and click on install Software. Click on 'Close' when the installation is completed.