How do I get this DOOM version?

an
- in Twitch
1

Moin, I just played through the new DOOM and would like to play the old parts.

But I don't find the version that Gronkh played in the stream https://www.twitch.tv/.../551875831

The game is in German and mods are available. Where can I find the version? Don't they exist on Steam?

Le