Microsoft Office 2019 ^hot^ — Portable

using DocumentFormat.OpenXml.Packaging; using DocumentFormat.OpenXml.Spreadsheet;

Plug in USB → Open folder → Double-click PortableApps.com → Launch Word/Excel equivalent. No installation, no Registry changes. Portable Microsoft Office 2019

Here is a little-known trick: You can install Microsoft 365 (which includes Office 2019/2021 features) onto a USB drive using the for IT pros. However: using DocumentFormat

If you absolutely require a desktop suite that runs off a USB drive without an internet connection, is the best choice. Available via PortableApps.com, LibreOffice is a completely free, open-source suite that is fully compatible with Microsoft Word, Excel, and PowerPoint files ( .docx , .xlsx , .pptx ). Conclusion LibreOffice is a completely free