Thanks to peetz
1. Download net-sky2-1-1.1.0.x86_64.vib.zip file and unzip it.
2. Copy the VIB file to a datastore of your host via the vSphere client
3. Put the host into maintenance mode
4. In a shell install the VIB file with the commands
esxcli software acceptance set --level=CommunitySupported esxcli software vib install -v /vmfs/volumes/your-datastore/net-sky2-1-1.1.0.x86_64.vib