If you get a memory stream related error and unity closes when adding this project it is because of some incorrect child scene elements, this has been fixed in 2.2.1 which is on its way to the asset store, however if you have this issue before this release goes live you can either:

- Email us or raise a support ticket and get the new version ahead of time

- On the scene which causes the issue, check the scene hierarchy for GameObjects with Behaviour Trees but also have some child element called BehaviourTree which contains a broken BehaviourTree script. Remove this child object and save the scene and this should fix the error.