There are a few different ways you can go about installing actions in Photoshop:
- One way, and probably the easiest way is to just drag and drop
the actions file ( .atn file ) on the opened Photoshop window.
This should work for both Mac and Windows.
- Second way is to install the actions manually by saving the actions file somewhere on your hard drive,
then launch Photoshop and open the actions pallet and click on the triangle in the upper right corner,
from the drop down menu choose “Load Actions” then locate the file from the file open dialogue box.