Got rid of Teamviewer. They say it's free for non-commercial use but they randomly shut you down claiming they "detected" commercial use. Tight VNC was an easy install after changing all computers on my LAN to static IP addresses. Setting up No-IP to connect remotely. Goodbye Team-commercial-use-detected-viewer.
There is one page total about setting it up on Windows.
That page is incomplete. One section has been truncated, and another is outright missing. One is critical, the other is security.
I don't know when the requirements changed, but unless you use the enterprise version of their software (with the enterprise license), you have to use the cloud to connect. No direct connections, even on a local network.