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How to change the unreal engine path ??

Hello, I have a little problem:
Here is my problem: I moved all unreal engine files to another disk. And as soon as I launch Unreal Engine from:
1 / Epic Game Laucher: Its me back again EVERYTHING.
2 / By a project file of Unreal Engine: “Failed to lauch editor” I doubt that it is very difficult to solve but if any solution I am interested.

Thank you in advance.