Office 2019 !exclusive! — Portable Microsoft

SoftMaker makes a high-compatibility office suite specifically designed for portability. Their FreeOffice version is legal, lightweight, and includes a ribbon interface similar to Microsoft Office.

Portable versions of Microsoft Office 2019 are typically unofficial, "repackaged" versions Portable Microsoft Office 2019

WPS Office by Kingsoft is a commercial suite that mimics Microsoft’s ribbon interface almost perfectly. They offer a portable version. Portable Microsoft Office 2019