It is possible to install the integration plugins for VMware on an ESX host directly from the Nimble website, provided your hosts have internet access:

1. Place the host into maintenance mode.
2. Connect to the host through a shell (e.g. SSH).
3. Run the command:

   esxcli software vib install -d http://update.nimblestorage.com/esx5/ncm

   Wait for the installation to complete.
4. Take the host out of maintenance mode and continue with the configuration.