To which I already replied in the same thread - use VLC which decodes CSS on the fly, unless you live in a country that doesn't believe in your freedom to play legally purchased content and prohibits doing that(United States of America).

Of course, it would be nice if Windows 10 just included that and saved everyone the trouble.

It's not only the US, see the post from the user noinsight here.

If you upgrade from a version that supported DVD playback rather than do a fresh install, the DVD playback will still be there.