Well I'll mention that twice now, I've installed this latest beta and got an error near the end with the installer complaining that it can't modify the the registry key associated with the .3DM file format.

This is on my XP machine at work and just now on my Vista laptop.

This is probably because I had Rhino installed previously on both of these machines.

I had to run RegEdit and change permissions (something I've never had to do editing the registry before); I didn't have permission to delete the .3dm key! After futz'n with the permissions I was finally able to delete the key.

I clicked retry from the MOI installer and it successfully completed...

-Will