Installation instruction: –
1) Uninstall any existing ms office package and then restart your system.
2) Then copy/paste following link in browser to  download the setup file 
https://officecdn.microsoft.com/db/492350F6-3A01-4F97-B9C0-C7C6DDF67D60/media/en-US/ProPlus2019Retail.img
3) Install downloaded office software.
4) Open any app like Word or excel.
5) Enter the product key and activate.