A genuine portable app runs from a USB stick without touching the host OS. Office is not designed for that.
End of support for Office 2016 and Office 2019 | Microsoft Support ms office 2019 portable version no need to install work
You may encounter third-party "Portable Office 2019" packages (often found as single .exe files or folders on USB drives). These are typically created using tools (like VMware ThinApp or Cameyo) that bundle the entire software environment into one file. The Risks of Unofficial Versions: A genuine portable app runs from a USB
A portable version of a software is a self-contained version that can be run from a USB drive, external hard drive, or even a cloud storage device, without the need for installation. This means that you can carry your office suite with you on a portable device and use it on any computer, without leaving any footprint on the host machine. These are typically created using tools (like VMware
If you find that MS Office 2019 portable is too unstable or risky, consider these alternatives that also require no installation.
If you download a file named Microsoft Office 2019 Portable.7z or Office_2019_USB.exe , here is usually what is happening under the hood: