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If you have questions about the license of Dufx, if you want to know what you can and cannot do with it, answers are here.
Dufx is compatible with all versions of After Effects since CS3.
1- Once you have downloaded the Zip-folder, quit After Effects if it is running, open Windows Explorer or Finder,
go to the folder “ScriptUI Panels” of After Effects
(windows : “c:\Program Files\Adobe\Adobe After Effects\Support Files\Scripts\ScriptUI Panels”
mac : “Applications/Adobe After Effects/Scripts/ScriptUI Panels”)
and paste in the three files from the Zip-folder.
2- Dufx is now available on the very bottom of the “Window” menu in After Effects.