This happen to me but i fixed it, it is pretty simple all you have to do is
1. If your client can't connect just close it then re-open it
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2. If your client wont open your computer just might be old, try it on a diferent computer
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3. you have to extract the file to your desktop open it then click on the program run.bat a black screen should come up and then the client should open.
Plz Comment on my stuff thankz.