No internet connection is needed to run RizomUV VS or RizomUV RS. However, you will need to use this website to purchase your license(s) and to generate a license each time you purchase or renew a license.
Please note that you can do this from a tablet or cellphone. You will need your Rizom Host IDs, and access to the website to generate the license file. So if you have one or two offline computers which will be running the software, just grab a demo, run it, note down the Rizom Host ID(s), access your cart or account page on anything internet-capable, enter them, and once the purchase is done, or the license file generated, you can just download and deploy it on the relevant computers.