First the entire DVD content must be copied to a folder to the hard drive. After the downgrade the Windows 7 installation, of course, must be re-activated.Īttention: In Windows 7 Ultimate Build 7100 (Release Candidate) the effort is greater. Only in a few Windows 7 programs some settings are reset to the initial settings e.g. Start Upgrading (even this sounds absurd):Īfter successfully downgrading the welcome screen shows the new version:Īlso the program 'winver' shows the successfully downgrading:Īll data, documents, music and movie files, installed driver and programs, shortcuts, program and user settings are retained. See here the differences of an English and a German installation:įor downgrading do not boot from Windows 7 installation DVD.īoot to Windows 7 and start 'Setup.exe' from DVD or after loading DVD the setup process starts automatically. The version name to be entered must be identical to the version name on the installation DVD. or into these for installing Windows 7 Home Premium:Ī re-boot after change of these registry keys is not necessary. into these for installing Windows 7 Professional.

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:īut with a change of a registry key whilst installation you can fake a minor version - so you can install the minor version If you have installed a preview version of Windows 7 Ultimate (e.g. The following procedure is from UnaWave - Installation - DowngradeĪ Windows 7 Ultimate Installation can normally not change into a minor version of 'Windows 7 Home Premium' or 'Professional'. You can downgrade Windows 7 Ultimate to Professional, or Home Premium.

Windows professional 7