Hey all - dink found a tiny bug in the testinstall script. It's patched in the downloadable tar.gz and zip file, but you can do it yourself quite easily. If you downloaded the file before the timestamp of this post then you have the problem. If you are reading this and haven't downloaded yet, you'll be just fine downloading it.
The problem is the script errantly reporting that the long command handler ("Prompt Handler") is not working. To fix it, open up the testinstall.php script and scroll to line 158, where you'll find the following lines of code. They are the only lines like it in the entire file:
$req->authName = $connections[$currCon]['authname'];
$req->authPass = $connections[$currCon]['authpass'];
They need to be changed to reference the zeroth connection record like this:
$req->authName = $connections['authname'];
$req->authPass = $connections['authpass'];
(that's a zero)
That's it! Thanks Dink!