There are two places where your plug-ins can be:
- In a folder on your hard drive named <Your Hard Drive>/Applications/Adobe Photoshop CC 2017/Plug-Ins.
(The exact name depends on your version of Photoshop.)
- Or if you installed to the shared Creative Cloud location, the Plug-Ins folder is located here:
<Your Hard Drive>/Library/Application Support/Adobe/Plug-Ins/CC