Portable Nmap on Windows is without admin rights or Npcap. For full SYN scans and OS detection, you need to pre-install Npcap (requires admin once) or use a different scanner like masscan (also portable). For quick TCP connect scans, it works perfectly from a USB drive.
If you prefer a visual interface, the ZIP archive usually includes . You can launch it by running zenmap.exe from your portable folder to see network topologies and saved scan results. Log to the USB nmap windows portable
From command prompt in the Nmap folder: