1. Download the swatch file (.ACO) it may be zipped so unzip.
2. Open the Colorswatch folder in nthe program directory ( Typically C:program files/adobe/photoshop(version)/presets/colorswatches
or in Mac open Mac open Macintosh HD/Applications/Adobe Photoshop (version)/Presets/Color Swatches
3. Copy/paste or drag and drop the .aco file into folder
4. Open Photoshop and look inder Window_> Swatches and voila!
Go into Swatch window on right of workplace in the little square setting box and click- you will see option to load swatches.
You can also share your Photohsop clolr shops with others easiliy using this saem methiod.
You can also use the option in swatch drop down menu, save swatches for exchange but I don’t know why not just use this easier method.