Yeah, SoftVNS is in a bad place right now and I’ll be happy to see it’s next full release. Using SoftVNS 3 beta on an intel is problematic, the jit < --> SoftVNS translation objects crash Max. Best advice is to use Jitter and the cv.jit library (it’s free) as you’ll notice the speed benefits on an intel. Otherwise find a PPC G5, download Max 4.5, Jitter 1.5 and Soft VNS 2.
As far as running them on your Intel under rosetta emulation I never tried it.
If you already have a PPC with Max 4.6 installed I believe you can run 4.5 and 4.6 on the same computer without uninstalling 4.6.