A Windows 7 Ultimate Installation can normally not change into a minor
version of "Windows 7 Home Premium" or "Professional". If you have
installed a preview version of Windows 7 Ultimate (e.g. beta, release
candidate build 7100 or RTM build 7600) and want to install a cheaper
version Windows 7 Home Premium or Professional the installation is
refused:
But with a change of a registry key whilst installation you can fake a minor version - so you can install the minor version
Change these registry keys
A re-boot after change of these registry keys is not necessary.
he version name to be entered must be identical to the version name on
the installation DVD. See here the differences of an English and a
German installation
All data, documents, music and movie files, installed driver and
programs, shortcuts, program and user settings are retained. Only in a
few Windows 7 programs some settings are reset to the initial settings;
e.g. in the "services". After the downgrade the Windows 7 installation,
of course, must be re-activated.
Attention: In Windows 7 Ultimate Build
7100 (Release
Candidate) the effort is greater. First the entire DVD content must be
copied to a folder to the hard drive. Then open in subfolder "sources"
the file "cversion.ini" and change the entry "
MinClient=7233.0" to "
MinClient=7077.0".
Then you can start the installation with "Setup.exe" (one folders
hierarchy up). After the installation the entire folder can be deleted.
2 comments:
http://www.microsoft.com/en-us/download/details.aspx?id=5842
(It will ask you to upgrade to SP1)
Download and update SP1 then re-run the windows 7 installer.
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