Get the google chrome extension working OR a Decod a file.

Hello i bought an extension for google chrome. But it doesn't work anymore, and I can't contact the creator because he has completely eliminated it. The extension is for a game Forge of Empires.
I know the extension checked with the external site to see if I was a VIP, But the website doesn't exist, I have no way to verify.

I have the complete ext, What I want to ask is
Get the extension working OR Decode a file .js

in a file .RAR Is a full extension
in a app.js is a file to decod