To run functionality implemented in the project, open Content/BCE_Files/BP_ActorWithoutSM and check Compiler Results. This project contains two EditorModules BPCompilerExtensionEditorModule and BPCompilerExtensionEditorModuleSimple. They do the same but one was created and added to the project in a way Samurais would implement it, and a second is simplified version created for post about BlueprintCompilerExtension. At the end of the post you can find brief overview of more complex implementation. https://uesamurais.com/2023/02/blueprint-compiler-extension/ By default both modules are enabled in project, but if you want to have only one active remove the other from .uproject file.