Intended for use with DecalMachine, but you will still get the all the necessary maps (normal, emission, masks, etc) for use in other means.

21 Decals are included in as zip folder.

Download the folder, unzip it/extract it somewhere.

Open Blender, have DecalMachine plugin installed.

Open preferences, scroll down to DecalMachine, under Decals import a new pack, navigate to the folder where you extracted these Decals.

Now the folder is installed, you can drag and drop Decals whenever and wherever you wish.