2019: Portable Microsoft Office

The open-source giant, LibreOffice (a descendant of OpenOffice), offers an official portable version via PortableApps.com.

If you must target Portable Office 2019:

If you need a real add-in with ribbon UI, task panes, or external automation, require an officially installed version of Office 2019 or later.

Would you like a full working VBA add-in template for Portable Office 2019 (e.g., a custom ribbon button that runs your automation)? Portable Microsoft Office 2019

A subscription to Microsoft 365 Family lets you install Office on up to 5 devices per user. While not "portable," you can install locally on each machine and sign in. Your settings roam via the cloud. This is the closest legal experience to "portability."

Using a cracked portable Office 2019 is software piracy. While individual cases are rarely prosecuted, if you use it on a corporate network or a client’s machine, you could expose your business to audits, fines, and reputational damage.

Bottom line: The "portable Office 2019" you find on torrent sites is a trap. Do not download it. If you need a real add-in with ribbon

If you have an internet connection, Microsoft’s free web apps (Office.com) are the only official way to use Word, Excel, and PowerPoint on any PC without installation.

LibreOffice is a full-featured office suite that reads and writes Microsoft Office files (docx, xlsx, pptx). The PortableApps.com version is verified, clean, and free.

For 90% of users (writing letters, basic spreadsheets, simple presentations), you will not notice the difference. A subscription to Microsoft 365 Family lets you

If the portable version registered its COM classes (rare), you could try late-bound automation:

Python example (runs externally):

import win32com.client as win32
To understand the intrigue, you have to look at how software is traditionally installed. A standard installation of Microsoft Office 2019 is a heavy affair. It buries itself deep into the Windows Registry, scatters files across system folders, and demands a permanent seat on your hard drive. It becomes part of the machine's DNA.
Portable Office 2019 is the ghost in the machine.
Created by third-party developers (not officially by Microsoft), a portable version takes the full suite—Word, Excel, PowerPoint, and sometimes Outlook or Access—and compresses it into a single, self-contained folder. It requires no installation wizard, no registry keys, and no tedious waiting. You click the executable, and Word opens. You close it, and it leaves no trace on the host computer.