I installed the P7 version of PoserPhysics to Poser 8 and it's working fine here.

I've also made M4 and V4 work in PoserPhysics (an error about a wrong bone or something always causes a fail with them) by making a copy of their respective .cr2 files and editing the word TongueBase to just Tongue, and resaving them (in my case as PoserPhysicsM4.cr2 and PoserPhysicsV4.cr2).