Go to https://setup.office.com and Click "Sign In" if you already have a Microsoft Account or "Create a New Account" if you do not have any Microsoft Account
Step 3: Enter your product KEY, select your country and language and click "NEXT"
Step 4: Install Office
Depending on your browser, select Run (in Edge or Internet Explorer), Setup (in Chrome), or Save File (in Firefox).
If you see the User Account Control prompt that says, Do you want to allow this app to make changes to your device? select Yes.
The install begins.
Your install is finished when you see the phrase, "You're all set! Office is installed now" and an animation plays to show you where to find Office applications on your computer. Select Close.
Follow the instructions in the window to find your Office apps. For example depending on your version of Windows, select Start and then scroll to find the app you want to open such as Excel or Word, or type the name of the app in the search box.