A Windows tool (later ported to other OSes) that lets you manually specify a Title ID and version. It downloads the encrypted files, then decrypts them using public keys (or common keys) to produce a loadable, installable format (like a .app or a WUP installable package).
Only use NUS tools to download games you have purchased physically or digitally. The tools cannot check this for you; it is an honor system. wii u nus
Handling commercial game dumps, keys, or distributing copyrighted content may violate laws or terms of service depending on jurisdiction. Use these techniques only with legally obtained copies and for legitimate preservation, repair, or development work. A Windows tool (later ported to other OSes)