For modern PC games, "portable" means the entire game is contained in a single folder that can be copied to a USB drive and run without installation. Heroes United was never developed as a traditional Windows EXE file, so there is no official "new portable" download. However, you can still achieve the same goal.
Which you are gaming on (Windows PC, Android, etc.)? Do you need help setting up a portable emulator ? For modern PC games, "portable" means the entire