Microsoft does not offer an official "portable" version of Office 2013. Downloads marketed as such are typically unofficial, unauthorized, and carry significant security risks.
: Download the official Office mobile apps for iOS or Android to edit documents from your phone or tablet. 2. Accessing Your Existing Office 2013 License
Microsoft Office 2013 Portable is a modified version of the classic productivity suite designed to run directly from a USB drive or external hard drive without a formal installation. While it offers high convenience for users moving between different workstations, it is important to understand both its benefits and the significant risks involved.
His workspace at the university was a graveyard of old ThinkPads and tangled Ethernet cables, but his most prized possession was a battered, 16GB Kingston flash drive hanging from his neck like a digital talisman. On that drive sat a "portable" version of Microsoft Office 2013
Microsoft does not officially release "Portable" versions of Office. These versions are created by third parties and often hosted on unofficial sites like Softonic or various file-sharing forums. These files can frequently contain malware, keyloggers, or spyware .