I know some posts addressed this, but I couldn't find the info on a quick search, so I apologize for the redundancy...

I ran part1 fine and am up and running. But I cannot run parts 2,3,4 (md5s are correct, I am administrator on the box). Are parts 1-4 just one install spanned?

Everything else is ducky.  Please confirm this in case I'm not installing goodies I should be installing.

If you had all 4 parts downloaded, and ran part 1, then the contents of the other parts were most likely automatically extracted. That's the intended way to run it.

If you eventually got the SONAR Setup Wizard to launch, and now have it installed, it sounds like you're good to go :)