Fingers crossed UT2004 will end up in the Archive eventually. I still boot it up to play occasionally because nothing else has scratched the arena shooter itch that well.
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I'm very hopeful this will get Epic's blessing too.
What is strange is that they approve of the archive.org download, instead of say, OldUnreal hosting it themselves. The archive.org uploader could update it with malware. It would be nice if they allow OldUnreal to host.