This post is aimed for users & clients who for some reason get their extensions as zip files without installers and need to manually plonk the zip folder somewhere and unzip the file there.
|OS||USER / ALL USERS||HERE'S WHERE YOU NEED TO UNZIP THE EXTENSION ZIP FILE|
You can press Command Shift G in Finder and paste
For Adobe CC2015 and before use
You can paste
|NOTES||(1) Replace TREVOR with your username if your username is not TREVOR
(2) If in doubt use the "All Users" folders
(3) Don't forget to Unzip the zip file!
(4) If the extension's not signed please see here how to make it usable.