@dkayiwa once this release has happened I think that someone with access to the core infrastructure (like you) should ensure that the demo server gets updated.
I would suggest doing a 2.5.1 maintenance release of the Reference Application distro which is exactly like 2.5 but just includes this new version of appointment scheduling. And updating demo to run this.
(I am not proposing refapp maintenance releases for minor bugfixes in general, but only in the specific case where top-level features are unusable. I.e. this case, and also the one where you can't capture environmental allergies.)