To find out, press Win + R and type winver on either desktop or Metro UI of Windows 8 Release Preview machine, and press Enter.
It’s an Evaluation copy, expires at 5:00pm on January 15, 2013, which leaves us 7.5 months to test out how good or bad this version of windows is. Since the RTM version will likely arrive before that day, most of us will just move on by then.
With the license key “TK8TP-9JN6P-7X7WW-RFFTV-B7QPF”, you can use Windows 8 Release Preview edition for free until it expires on Jan 15, 2013.
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