In the Revit.ini file, the settings in the [ImportIFC] section controls the options used when importing IFC files.
Defines the processor which imports the geometry used when Linking IFC Files. Legacy uses the open source engine used in Revit 2024 and earlier. AnyCAD uses a combination ofthe open source engine and the AnyCAD technology.
Type = String
Valid values = AnyCAD (default), Legacy
[ImportIFC] LinkProcessor=Legacy