SpinDynamica 2.5.4 has been posted here:https://www.dropbox.com/sh/8hp7zwr8xo6r04b/h5RShfDFBn
There have been some important enhancements and bug fixes in Trajectory.
It was found that Trajectory in v2.5.3 was not evaluating sufficiently accurately in some cases.
v2.5.4 also includes some major speed enhancements to the EnsembleAverage within Trajectory.
The documentation files have been updated.