I have found that after trying a bunch of different setups during the years. Kodi, Plex, etc. I have settled on using: Sonarr[0], Radarr[1] and Lidarr[2]; combined with Jacket[3] and your favorite torrent downloader (I use Deluge). Add the TV Series you follow or movies you want to watch.

This setup downloads everything for me once a movie or episode becomes available to download, and then I only watch content that is already downloaded using VLC. This is pretty good specially if your Internet connection is a bit spotty at times.

I've been using this setup for years now, and I'm pretty happy with it.

[0] https://sonarr.tv/ [1] https://radarr.video/ [2] https://lidarr.audio/ [3] https://github.com/Jackett/Jackett