Can't you put it on the internet when you see updates have come down to your other computers, do the download, and then disconnect?

I have desktop shortcuts to drop off and rejoin the network from a shortcut. Right click, run as administrator, sets my NIC to disabled. I do that every night. In the morning, click the "net on" icon and come back on. Simple batch files I can send you. All you have to do is make sure your NIC is named what the batch file is or edit it. Typically the default NIC is just called "Ethernet".

There is a lot of paranoia about the evils of the internet. Most of it is not needed. If you don't click on executables or go to suspicious web pages you won't get nailed.

So no more "Asian teen escorts" pages for you young man!!!