Revit 2024 Library Location. The content packs are intended to install into the content path specified when revit 2024 or revit lt 2024. Autodesk content (templates and families) associated with the annual release are installed by default with the program.
During installation, you can specify a top level path for revit content. I am using revit 2020, and the library panel only has the aec materials and is missing the autodesk materials.