Open the browser and enter Microsoft365.com/setup in the URL bar and press Enter. Click the blue sign-in button and enter your credentials to sign in with your Microsoft account. You can use any account associated with any Microsoft service like XBOX, Skype, or Windows. However, if you are new to Office, click Create New Account to create a free account with Microsoft. Enter your 25 alphanumeric product codes or enter the required fields and click Next. On the Account page, click the Install Office button on the right. side of the window. This will open another page.