Step 1: Follow the steps in this video https://youtu.be/b0m1T-9aF7M
Step 2: Now Navigate to Retouch Preset folder and open Retouch Preset.tpl with Photoshop.
Step 3: Once Photoshop is open in the main menu Goto Windows>Extensions>MagicRetouchPro to open the extension.

 	Installation complete.