: Open Photoshop, go to Window > Actions , and select Load Actions from the panel menu to import the .atn file from your downloaded folder.
Unlike generic free scripts, MANTRA is typically distributed as a paid professional tool. Official Purchase
While the original Mantra script is proprietary, the open-source community has built "Mantra-like" scripts (often named "Separation Studio" or "Action Set 2.0"). These are available on GitHub.