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'StatusChangeResult' does not exist in the type 'TrackableBehaviour'

I followed the official guide how to setup Vuforia with HoloLens. I'm using Unity 2019.21f1.  After downloading the HoloLens Vuforia Sample I get a bunch of errors. I have to go manually to package manager and download Vuforia Engine, in this case 8.5.9. HoloLens vuforia example is 8.6.7. After I install it I get one error: Assets\SampleResources\SceneAssets\ModelTargetsTrained\Scripts\ModelTargetAugmentationHandler.cs(66,61): error CS0426: The type name 'StatusChangeResult' does not exist in the type 'TrackableBehaviour'. If the problem is the discrepancy between Vuforia engine and the example provided, where can I get the newer Vuforia Engine?

Hi,

We have a post regarding the Upgrade: https://developer.vuforia.com/forum/unity/how-upgradeinstall-vuforia-engine-86-sdk

summary: follow the steps in: https://library.vuforia.com/content/vuforia-library/en/articles/Solution/vuforia-engine-package-hosting-for-unity.html