Troubleshooting - NitroxNova/humanizer GitHub Wiki
If the editor keeps crashing after you open it, especially after a new update, try deleting the .godot folder and then reopen the project in godot. make sure the humanizer plugin and humanizer global are enabled under the project settings, and then open the authoring scene to make sure it works.
If the character is stuck in T-Pose in the authoring scene, just hit the reset button and the idle animation should resume