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ControlledApplication.SubVersionNumber

Property
Description:
The minor version number of Revit
Remarks:
SubVersionNumber of Revit may have additional APIs and functionality not available in the standard customer releases. Add-ins written to support standard Revit releases should be compatible with SubVersionNumber releases, but add-ins written specifically targeting new features in SubVersionNumber releases would not be compatible with the standard releases.
Syntax
public string SubVersionNumber { get; }