You are right, the last Mac package was some testing version. So you will get a message that a newer version is available (which there is, just not a Mac package for it).
There are a couple of issues while running Pigeon Planner on Mac, as you will notice. Some of them which I can't fix and some which I haven't had time to fix. I'll see if I can build a new one and mark it as unstable, just for the people who really want it.