Loading a Brush (abr file) using Photoshop CS or Creative Cloud:
1.) open your brush pallete
2.) in the upper right hand corner you will see either a triangle or a symbol that looks like a flower (depends on what version you are using).
3.) click on this icon and a menu will appear. Click "load brush."
4.) choose that brush you would like from your computer. The brush will be in ABR format
Scroll down for a video tutorial