What is the identity of dark matter? Like your question, we don't know...
There's my unofficial one. It's listed in the OP as an unofficial bugfix.
0.5.2 doesn't do much though, only need it if you run into bugs when cheating in English class.
Does your unofficial one updates the game from 0.4.1 directly 0.5.0?
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ThePresident451 posted the ep4-5 playlist to YT, including this track.