Group similar textures together in folders before pasting them into the main Materials directory to keep your dropdown menu organized.
Ensure the SKM materials match your SketchUp version capabilities. Download SKM zip
Extract the contents of the ZIP folder to a convenient location on your computer (e.g., your Desktop or a dedicated "SketchUp Textures" folder). Group similar textures together in folders before pasting
Open the extracted folder to ensure the individual .skm files are visible. Install in SketchUp: Download SKM zip