Did you read link thoroughfully?
You don't need to download anything. It is embedded.
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The three levels and episode name are in fact untitled and can only be accessed via a warp command.
E6M1 (aka Raven's Lair)
E6M2 (aka The Water Shrine)
E6M3 (aka American's Legacy)
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simply types the code while playing (this also applies while in automap mode). After the last letter has been entered, a message of acknowledgement will appear at the top of the screen.
engage## Warps to level E#M#.
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