Check one of the video clip,
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from
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. It should explain what you need to do.
In addition, I have confirmed it works. When you run the decryption file, it should be in same location where it ran from. I use custom Java and it place it in another location. As you watch the video clip it is pretty straight forward. You may need to watch it several times and then go through step by step by pausing the video and if need, go back a bit until you understand how it goes forward. The video may be a little quick, however it works.
Have a great day and be safe...