Open the Package Manager in Unity (Window->Package Manager), select Badger HTN press install.
Click "Import" to add Badger HTN. "Examples" can be excluded but "Resources" and "Scripts" are required.
Import Badger HTN.
Examples - Rendering Pipeline
Some examples have assets and are using materials from the standard rendering pipeline and if you have URP or HDRP in your project you will have to upgrade the materials.
Upgrading example materials.
Information about converting materials can be found here: