Usually codes should be redeemable via the Bethesda account (https://quake.bethesda.net/en) or the Steam library. But unfortunately I have no idea what kind of account you get with Game Pass. If all else fails you could try to ping u/SyncError, he's a/the developer and often willing to help. Source: almost 2 years ago

Here you go man! I found this through the official Quake.com home page. Source: about 3 years ago

First I gotta shout out my man Nifflas. He was relatively big in the freeware community back in the 2000's, but he's kind of fallen into obscurity lately. He made such classics as Within a Deep Forest, and the Knytt series. All great. He still makes games, with his most recent release being Ynglet, which is on Steam! This is his website right now, apparently. I swear it's not viruses. Source: over 1 year ago

Give Within a Deep Forest or Knytt a try. Both were made by indie developer Nifflas, whose webpage is kind of defunct but still has the relevant links: http://nifflas.ni2.se/. Source: almost 2 years ago