Not working for me:
UnPackage::SerializeFName:pos=00000D7C <- TArray::Serialize:0/1099432436 <- FReferenceSkeleton<< <- USkeletalMesh4::Serialize <- LoadObject:SkeletalMesh4'kart_frame_model_rigged.kart_frame_model_rigged', pos=D7C, ver=482/0, game=ue4.18 <- UObject::EndLoad <- LoadWholePackage:kart_frame_model_rigged <- CUmodelApp::ShowPackageUI <- Main:umodel_build=1131
Sadly..
I have a licensed version, I did not find such a model in the archive of the game. The only kart that I found opens without problems.