In zip files, you will find the files called nurswirls.abr and nurdesign.abr
You should extract the file to your Photoshop/Brushes directory.
To load a brush set in Photoshop, open the Brushes Palette (Windows > Palettes > Show Brushes).
Select Load Brushes from the flyout menu on the Brush Palette.
You should keep your brushes in a subdirectory of Photoshop in a folder named brushes.

From the Brushes Palette in Photoshop, click the small arrow in the upper right corner of the palette, and choose load brushes.
Locate the directory where you have stored the brushes (.abr files) and select the file you want and click "load".
The brush set will be added to the current brushes.

Another way to add brushes in your directory just copy and paste them after unzip it as .abr file
such as C:\programfiles\adobe\photoshop\presets\brushes

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