Gewwit

Alright, at least I know now what the problem is. Thanks!

Yes, I'm still trying it with Unreal 4.9.
I also tried different assets (and created a simple cube with size parameters).
The file extensions are .hdanc .
When I drag the asset in the scene the Output log says:


LogHoudiniEngineEditor: PostSpawnActor, supplied Asset = 0x0000000019927F90
LogActorComponent: UnregisterComponent: (/Game/StarterContent/Maps/Minimal_Default.Minimal_DefaultersistentLevel.HoudiniAssetActor_5.StaticMeshComponent_19) Not registered. Aborting.
LogHoudiniEngineEditor: PostSpawnActor, supplied Asset = 0x0000000019927F90
LogHoudiniEngine: HAPI Asynchronous Instantiation Started. Component = 0x0, HoudiniAsset = 0x19927f90, HapiGUID = 180591D04254F1551535DE91D628EA1A
LogHoudiniEngine: FinishedInstantiationWithErrors.

Ok I've uninstalled all versions and installed 15.0.308 to a new path but it still doesn't work. Maybe I'll need the Indie license now?