Download and unzip the files in your computer

Copy and paste the .abr files to Presets

Brushes in your Adobe Photoshop folder

Go to Photoshop, click Edit (from the menu) and click Preset Manager

Select Brushes from the dropdown of the Preset Manager popup box

Click “Load” button on the right side of the popup boxOK

Select the .abr file and click “Load” button and then click “Done” button and the brushes are installed

You may need to repeat the same process from point #5 to load more brush sets