I use newsdemon as my primary provider with a few block accounts as backups.
I would personally recommend sabnzbd as the downloader paired with sonarr and radarr to handle searching for TV and movies specifically. These are all web apps but they can be run on Windows but also could be running on something as simple as the raspberry pi and then remotely accessed from another computer in your network.
You will also need a indexer, popular recommend ones are nzbgeek or dognzb. Most of these charge either a yearly or a lifetime sub fee but take that with a grain of salt, they often take it away.
They work great for office PCs when we need to add extra outputs. Maybe not this specific version that heatsink looks a bit tall to fit in most half height cases.