CSLA 4 version 4.5.30 is now available via nuget and the download page.
This version includes a number of bug fixes and some new features and is a recommended upgrade from 4.5.20.
Perhaps the biggest new feature is the ability to create classes that are invoked by the server-side data portal to simplify the use of IoC containers and DI as the data portal creates and interacts with root objects on the server. See the CustomActivator sample to see how this works.
Here's a list of changes:
https://github.com/MarimerLLC/csla/issues?milestone=4&state=closed
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