To install the library, follow these simple steps:

1. Open Blender and go to Edit > Preferences.

2. Navigate to the File Paths tab on the left.

3. Under the "Asset Libraries" section, click the '+' button to add a new path.

4. Browse to and select the main folder you extracted. Ensure this folder contains your 'Quick Craft - Stitches.blend' file, the 'blender_assets.cats.txt' catalog file, and the 'Preview' folder.

5. Save your preferences, open a new Asset Browser window in Blender, and change the library dropdown from "Current File" to your newly added library path.