Download the the offline bundle (depot file) for ESXi 6.0 from here
filename VMware-ESXi-6.0.0-2494585-depot.zip
Activate SSH, shut down all your VMs and enter maintenance mode
Upload the file to your datastore
Note: If you run the command with “install” switch, all your personalized drivers of officially unsupported NICs will be deleted. You might consider using the second command with the “update” switch instead (you can add option –dry-run to perform a dry-run only)
esxcli software profile update -d /vmfs/volumes/datastore1/VMware-ESXi-6.0.0-2494585-depot.zip -p ESXi-6.0.0-2494585-standard
more info