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The Build 7137 Beta Is a Beta version and not an RC released to the public the original RC build 7100 you can get from here http://www.microsoft.com/windows/windows-7/ they will give you a key, as for expirations though all of the Beta builds will expire before the RC7100 you can read the expiry dates here Windows 7 Release Candidate Customer Preview Program That page will inform you about this: The Beta expires on August 1, 2009, and bi-hourly shutdowns will begin July 1, 2009. The RC will expire June 1, 2010, and the bi-hourly shutdowns will begin on March 1, 2010. In both cases, you’ll need to rebuild your test PC to replace the OS and reinstall all your programs and data.