You need to edit a document quickly on a guest computer. You do not have administrator rights to install software. A quick web search brings up exactly what you want:
Virtualized Office applications frequently crash, freeze, or fail to open specific formats. Unsaved progress, corrupted documents, and lost work hours. ms office 2019 portable version no need to install work
While third-party sites may distribute unofficial "portable" versions, these carry significant security and legal risks. Unofficial Portable Versions: Risks and Limitations You need to edit a document quickly on a guest computer