After downloading the .zip file, extract it and place it in a location that will be easy to find. If you’re using one of my mine VDM kits, they’ll be both a PDF user guide along with the .blend file. Open up a new scene and go to File + Append. Locate the .blend file and click Append. Open the brush folder + select the brushes that you want to use in your file. Most creators will add a unique name that will make them stand out from the default one’s.