Follow the instructions below to install office on a Windows computer:
Go to office.com/setup through your internet browser like chrome,Firefox or Internet Explorer.
Now Sign in with your Microsoft Account that you have created already else If you don’t have an Microsoft Office account you need to create a new one.
Once you are signed in select "Install Office".
It will ask you to enter your product key,complete this process.
Then Office 365 will be automatically Installed your Windows PC or Mac.
Depending on your browser.
Run, Setup or Save File.
Open the file you saved and follow the onscreen Instructions.
For more assistance regarding office 365 setup please do visit : www.office.com/setup