To obtain and install catalogs for KitchenDraw 6.0 , you should follow the official procedure provided by the developer. While you may find third-party "free" links, the most reliable and secure method is through the official KitchenDraw catalog page Guide to Downloading KitchenDraw Catalogs
Sites like KitchenDesignForum or specialized Facebook groups often share legacy .cat files. If you are looking for a specific version of Catalog 2 that has been modified with custom textures, these communities are your best bet. How to Install the Catalog 2 Link (.cat file) free kitchendraw 60 catalog 2 link