Go to office.com/setup or www.office.com/setup, office setup website.
Open your favorite browser and enter the URL www.office.com/setup or www.microsoft365.com/setup and hit enter. You can also search for office.com/setup from your browser search.
Sign In or Create a New Microsoft Account.
Click Sign In and use your Microsoft account Email, Phone, or Skype Id to Sign In, If you do not have a Microsoft account you can click on the Create a new account button.
Enter 25-Character Product key, Select Country and Language.
Once signed In you will now need to enter your Product key which is in XXXXX-XXXXX-XXXXX-XXXXX-XXXXX format. Your product key will be in your email associated with Office or on the retail packaging. You may also need to select your country/region and Language. Click Next.
Click "Install Office" button below your Office Subscription.
Now you will be on your Office account page, you will find all your Purchased subscriptions and Products there. Find Microsoft Office and Click Install under the Product Information.
Save and Download Office Setup.
Click Install Again and the Office setup will download. According to your Browser, Save the Downloaded Office setup.
Run Setup and Finish Installation.
Run the downloaded installation file and your installation will begin. Sit back while the installation is in progress. Once the installation is finished. Click Close.
Run Office Apps, Accept License, Installation Complete.
Once the Installation is Complete, Open any Office App like Word and Accept the license. Once you accept the license, your Office is activated and Installation is Finished.