We have decided to make 2D Inverse Kinematics (IK) a fully supported feature going forward. To do this we’ve decided to include IK in the 2D Animation package from 5.0.0 onwards. This will simplify its deployment and reduce confusion. This is planned for Unity 2020.2. Once this is released, if you are using the 2D IK preview package you will have to uninstall it and install the latest 2D Animation package. We expect all scenes and projects that utilise 2D IK to be upgradable in this way. If you have questions or concerns about this plan, let us know about it in this thread.