Just an observation. I've been on Windows 10 for a few years now, and I don't recognize this "Windows keeps downloading stuff". Once a month, there are patches - and staying patched is generally a good idea.
As long as you are on Windows Pro or Enterprise, you have control over WHEN you want the patching to happen, unless your company has overriding policies - in which case you need to butt heads with the IT department to get them adapted to your needs. If you are using Windows Home, you need an upgrade.
Disabling/Enabling your network connection on the PC to avoid patching seems like the wrong solution, because you really need that working connection to get work done. If you really need to block something, do it in a firewall rule. Most routers can do that.