I think something might have went wrong with the comments at http://redump.org/disc/15313/
First, the comment about the broken uninstaller must refer to Myth II. That was the one were version 1.0 was recalled days after being shipped according to all sources I can find. So the comment probably belongs here http://redump.org/disc/95145/.
Second, I thinks this might not actually be a Mac hybrid disc. On the original Myth, PC and Mac releases were separate SKUs, and I cannot get the disc to mount in a Mac emulator. I am far from a Mac expert, however.
Since Myth II is indeed a PC/Mac hybrid and it had the uninstaller problem, did comments for Myth II possibly end up at the Myth I record somehow?
Fixed below -Nova
And also regarding Myth, about the two Beta releases http://redump.org/disc/108094/ and http://redump.org/disc/108093/
Was it confirmed these were US-specific? Because the Eidos branding leads me to wonder whether they should be European instead, because Eidos published the game in Europe only AFAICT.