For user who must perform in-place downgrade, there is a workaround trick that can force Windows 7 setup installer to allow “upgrade” or downgrade from uplevel edition of Windows 7 to downlevel version of Windows 7, while retaining all installed application software, drivers and migrating all documents, music, video, shortcuts, bookmarks, favorites, and personal data files or settings. Microsoft probably forbids downgrade for a reason, such as possibility of corrupting or messing the operating system and complexity involved in such downgrade. End-users also have to go through the hassle of backup all data files when clean install is required. The situation can also apply to user who installs Windows 7 Ultimate or Professional edition, but now wants to go legit by buying or being given a gift of Windows 7 Home Premium license. For example, users who installed Windows 7 Ultimate during beta or release candidate phase of Windows 7, but now acquire a Windows 7 Home Premium or Windows 7 Professional license. The refusal of Windows 7 to downgrade causes several groups of people some headache, especially when user doesn’t want to lose and wipe off existing programs installed. To install a new copy of Windows 7 Home Premium, click the Back button in the upper left-hand corner, and select “Custom (advanced)”. To save your files before installing Windows, back them up to an external location such as a CD, DVD, or external hard drive. You’ll need to reinstall any programs using the original installation discs or files. You can choose to install a new copy of Windows 7 Home Premium instead, but this is different from an upgrade, and does not keep your files, settings and programs. Windows 7 Ultimate cannot be upgraded to Windows 7 Home Premium.
If user attempts to perform an in-place upgrade to downgrade to lesser edition of Windows 7, an error similar to below will be displayed at compatibility report: Upgrade is only possible one-way from the lower edition to higher edition of Windows 7, and not the other way round. Starter -> Home Basic -> Home Premium -> Professional -> Ultimate
Windows 7 SKUs or editions have a hierarchy as below: For example, it’s impossible to downgrade from Windows 7 Ultimate to Windows 7 Professional or Enterprise, or from Windows 7 Professional to Windows 7 Home Premium or Home Basic. Windows 7 does not allow users to “downgrade” or convert from a more premium and more expensive edition to down-level, more basic and less expensive edition.
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