As usual, the update release uses service pack technology and does not require a full install.
Prior to installing the Update Release 1, please verify that you are running the First Customer Ship build of Autodesk Revit 2014, build 20130308_1515.
After the update, the build number specified in the Help > About dialogue will be 20130709_2115.
Revit 2014 Update Release 1 API Enhancements
Here is the list of API enhancements provided by this update:
Allows a drag/drop operation (UIApplication.DoDragDrop) to initiate from a dockable window.
Improves the ability to include any type of component inside a dockable window without it disappearing during Revit redraw efforts.
Allows UIApplication.PostCommand() to work consistently for Add-in created commands.
Triggers an updater callback for ElementChangeTypeGeometry related to rebar and other reinforcement elements when their geometry changes.
Improves stability for FamilyManager.NewType() on families which have no defined types already.
Allows FamilyManager.Set(ElementId) to work correctly for family parameters of type LoadClassification.
Improves stability for reading Mesh and MeshTriangle elements.
Creates the default schedule header automatically when schedules are created by ViewSchedule.Create() methods.
Allows ViewSchedule.GroupHeaders() to succeed even if the schedule is not active.
Allows Connector.DisconnectFrom() to consistently remove unneeded information from the associated element, so that it can be reconnected as needed.
OpenOptions.SetOpenWorksetConfiguration() allows null to remove the existing configuration.