Office 2007 Portable Edition ((free)) — Microsoft

If you have an original Office 2007 installation disc and a 25-digit product key, you can still install it on a PC, though it is not officially supported on newer operating systems like Windows 11. Microsoft Support Install Office 2007 - Microsoft Support

(if needed for your paper):

: To run Word, Excel, or PowerPoint directly from a USB flash drive without modifying the host computer's system registry. microsoft office 2007 portable edition