Flamingo nXt 5.5 cannot find Zoo license

After upgrading to Rhino v6 I received dialog boxes telling me to check for updated plug-ins. Following that link I saw that Flamingo and Penguin updates were available for Rhino v6. I downloaded and installed both.
The Penguin 2 update wasn’t new at all. The Flamingo update affected both Rhino 5 (32-bit and 64-bit) and Rhino 6 (64-bit).
Now, I don’t see a Penguin plug-in. After choosing Flamingo nXt 5.5 as the current renderer, I learn that it can’t find a license or the Zoo, which is running on the same machine from which Rhino v6 is run.
I uninstalled both Penguin and Flamingo, then re-installed. The Penguin installer allowed me to choose the Zoo for a license. I did not have that choice with the Flamingo installer. Instead, I had to choose between Anyone or Just Me.
What do I need to do to get Flamingo nXt 5.5 working with Rhino v6?

Just tried to change my license, then chose “Use the Zoo.” Still couldn’t find the Zoo.
Tried “Enter you license key,” but it wouldn’t accept my Flamingo 3.0 CD-Key.

What is going on here? I thought that nXt was actually FL30.

Getting the free upgrade to nXt 5.5 fixed the problem.