For installing extensions in Photoshop CC 2014 and 2015:
Download the zip file and unzip it.
NOTE: If you don’t see the CEP/extension/ folder you can create it.
Copy the CC2015 extension folder to:
You’ll find the extension at Window > Extensions > Name of the Extension
Do not modify the extension folder. It will cause a “The extension could not be loaded because it was not properly signed” error.
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