Installation instruction: –

1) Uninstall any existing MS office package and then restart your pc.
2) Then copy/paste following link in browser to  download the setup file

http://officecdn.microsoft.com/pr/492350f6-3a01-4f97-b9c0-c7c6ddf67d60/media/en-us/ProPlus2021Retail.img
3) Open any app like Word or excel.
4) Enter the product key and activate