Got OldUnreal's UT'99 working on my 2015 MBA11 (Mojave) and Retina MB12 (Big Sur)...UT'99 never got a Carbonized Intel build until OldUnreal got one going...and it's 64 bit native. Not sure if it's Universal Binary 2 so M1/M2 support will be a question.
Installed the HD texture pack just to see what happens...was not disappointed.
Full 60 fps on the MBA11 on its native 1366x768 resolution (with a i5-5250U)...
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On the MB12 with the Core M 5Y70, it's pulling about 45 fps on its native 2560x1600 resolution, but pegged at 60 fps when run at its usual “Retina” scaled resolution of 1280x800 (which requires 1/4 of the bandwidth).
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The fact that the game worked well on Broadwell GT3 graphics (around the same horsepower/theoretical VRAM bandwidth as a GT730) isn’t entirely a surprise. And now, the “fun” job of convincing OldUnreal.com to do the same for UT2004SE (which can use a 64 bit universal binary 2 port)…