If you are a freelancer sometimes you don't have access to the ScriptUI Panels folder. Here is a tip on how to run scripts outside of that folder.

• Save the script anywhere you have access like the Desktop or Documents folder
• If the script extention is .jsxbin, then rename it to be .jsx 
• In After Effects choose File -> Scripts -> Run Script File
• And choose the script file from the Desktop of where ever you saved it
• You won't be able to dock the script but it should be able to run normally otherwise