OK, when I re-loaded Behaved the Errors were gone, but when I clicked 'prefs' and OK, without changing anything, the errors were back. I am annoyed enough that what I will do now is delete BehavEd and download anew. That may fix it.
No .h files, but now I d/led and extracted to C:\Radiant Tools. That'll squelch any path length issues.
EDIT - It says I am missing the following files:
bstate.h (AHA! That's a biggie!)
Odd, I HAVE THESE. What the heck?