Thanks for reaching out. When you mention you can’t get Roon to operate, what are the exact symptoms you are having? It sounds like you can’t connect to the Nucleus, and the most often issue in this area is a firewall blocking local network access.
Since you are using a Windows PC, I would verify that both Roon.exe and RAATServer.exe have been added as exceptions to your Windows firewall.
You can use these instructions to add the exceptions and the executables themselves would be located in your Database Location/Application folder path.
I would also add these exceptions to any Antivirus or other Firewall blocking applications you may have and ensure that you connected to your network via a Private network, not a Public one, see this guide for more information.