When downloading from the Software Download Center, you will need to authenticate using a valid Cisco Service Contract that covers the target Nexus device.
Ensure you have enough space on the bootflash: (roughly 1GB). nxos703i79bin download link
The expected MD5 checksum for nxos.7.0.3.I7.9.bin is d31d5b556cc4d92f2ff2d83b5df7b943 . When downloading from the Software Download Center, you