Wierd looking Client

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Hello, when I started my Client it updated toward the picture attached. I can't find any information in the internet about it, does anyone have a clue as to why, how and where I might find more information about it? I was so foolish to enter my username and password and then I get redirected to the normal client and can actually play games. When i click on the version number this appears: Foundation: 2880901 UX: 2880901 Thank you in advance.
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