Cisco does not provide the NXOSv9k image for free on its public download portal (Cisco.com) without a valid service contract. However, because this specific version (7.0.3.I7.4) is older and widely used for learning, several legitimate channels exist:
: The primary source for all Nexus software is the Cisco Software Download page. Access typically requires a valid Cisco Connection Online (CCO) account and an active service contract.