TubeArchivist works well for me. It also has a metadata plugin for Jellyfin

The EULA states that you are not allowed to remove Steam’s DRM from the game, so the compiled version and the Steam version will have to be authenticated through Steam’s servers anyway. It looks like you can compile the game with Visual Studio, but you won’t be able to play it without buying it first or breaking laws.

The free downloads are slow, but as books are usually small, it is perfectly usable without donating.