Since nothing is installed in the system folders, you don’t need administrator permission to use it.
While technically a cloud app, Google Sheets allows offline access via the Chrome browser extension. You can set this up on a portable Chrome installation, giving you a portable spreadsheet environment. excel+2013+portable
Instead of risking a portable version of outdated software, consider these modern, safer options: Excel Online Since nothing is installed in the system folders,
Located at the very top left, this provides one-click access to Save, Undo, and Redo. Quick Setup Checklist (Standard Installation) consider these modern