Install Office2016 for mac with Office Suite Install, but DO NOT RUN OFFICE AFTER INSTALLED To check it, you can see details in this comment Office 2016 16.11 for macOS VL2 license The Serializer.pkg in this gist is signature by Microsoft Corporation Official. Here is the official download link for Microsoft_Office_License_Removal tool. If you alaways been asked for 'Sign in' and still requires activation, please try to remove Office license files on a Mac. Run Microsoft_Office_2019_VL_Serializer and it will automatic activate Office 2019
Microsoft_Office_2019_VL_Serializer.pkg official link.Microsoft_Office_2019_VL_Serializer.pkg in this gist.Manual download and install Microsoft_Office_2019_VL_Serializer.pkg
