Win 8 system downgrade problem

  

a, buy pre-installed Win 8 Professional PC

b, can be downgraded to Win 7 Professional or Vista Business Edition

c, in need Then upgrade to Win 8 Professional, because the license has been obtained, and the upgrade is free, users can upgrade at any time.

Note that you need a Win 7 Professional or Windows Vista Business Edition media CD to achieve a downgrade from Win 8 Pro.

Understanding downgrade rights:

http://www.microsoft.com/oem/zh-hans/licensing/sblicensing/Pages/downgrade_rights.aspx?mtag=HP-P-W8# Fbid=1sNUdGPTWF3

Downgrade rights details and frequently asked questions:

http://www.microsoft.com/oem/zh-hans/licensing/sblicensing/Pages/what_to_do_downgrade_rights.aspx#fbid =1sNUdGPTWF3

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