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 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.