Step 1: Download and install ZXP HERE or HERE
Step 2: Open ZXP Installer and select the downloaded Magic Retouch Pro zxp file from Automatic Installation folder.
Step 3: Launch Photoshop and goto Windows>Extensions>MagicRetouchPro.
Step 4: Open Retouch Preset in Photoshop from Retouch Preset Folder.
In case you are having difficulties using the automatic mehtod you can install it by using the manual method below.
Step 1: Open the Manual Installtion folder form the Magic Retouch Pro package which you downloaded.
Step 2: Copy MagicRetouchPro folder from Manual Installation folder and paste it to the folowing directory
C:\Program Files (x86)\Common Files\Adobe\CEP\extensions\
C:\Program Files\Common Files\Adobe\CEP\extensions\
If the Adobe\CEP\extensions folder does not exist, you can create it.
Relaunch Photoshop and goto Windows>Extension>MagicRetouchPro
Step 1: Open folder /Library/Application\ Support/Adobe/CEP/extensions/ or you can open this folder via terminal by entering "open/Library/Application\Support/Adobe/CEP/extensions/" command without quotes.
Step 2: Navigate to downlaoded Magic Retouch Pro folder than goto Plug-In>Manual Installation and copy folder MagicRetouchPro and paste it in /Library/Application\ Support/Adobe/CEP/extensions/ folder.
Step 3: Relaunch Photoshop and goto Window>Extension>MagicReotuchPro