Are you looking to download/install or activate the Microsoft office on the Windows 10 or Mac having any technical issues can follow the on screen instruction are as following. How do I install office 365 on my PC? 1. Visit web office.com/setup and sign in with your Microsoft account. 2. Enter your product key or Activation key 3. Select download/install MS Office. 4. If the User Account Control asks whether you want to allow the app to make changes to your device, select Yes.