Trial is free of charge and is limited to 150 devices.
If that is sufficient for your needs feel free to use the product without cost, and without support.
Trial is also a good tool to turn loose in your lab. That way you can prove it won't hurt anything and it will give you an example of the information that is gathered.
Submit here will send you an email at this address with a link to download the compressed tarball (.tgz) containg the image.
There are both KVM and OVA based images available.