Those who have not yet installed Windows 7, should know that it is possible to download the version of Windows 7 Enterprise, which can be used for 90 days, from the Microsoft website. Windows 7 Enterprise Edition is the version for companies, absolutely not suitable for personal use because it includes many heavy and useless functions and services for home use of the computer.
Windows 7 Ultimate would be an optimal choice but also Windows 7 Professional or the Home version can give the necessary and sufficient.
If, however, it is easy to upgrade Windows 7 from a lower version to a higher version (therefore from Professional to Enterprise), it is absolutely not possible to do the reverse downgrade operation, that is, to switch from Enterprise to Ultimate or Professional .
Those who have Windows 7 Enterprise can use a small tool that automatically allows you to downgrade to an earlier or lower version.
This small portable tool is simple to use: just start it from the Windows 7 Enterprise system, select the version you want to install and then, after inserting the Windows installation disc, select 'upgrade' to downgrade.
Windows 7 Downgrade can only be used to switch between Windows 7 Enterprise and Windows 7 Home, Professional or Ultimate.
Not having tried it, I am unable to say if, as an installation disk, it would be enough to use the downloaded one of Windows 7 Enterprise or if it is necessary to recover an original copy of the Windows version that you want to install.
However, following this guide in Italian, it should be possible to transform the Enterprise DVD into an installation DVD of another Windows version.
After changing the version of Windows, everything will remain the same, programs and customizations will be intact but it will be necessary to re-enter the license code that can be purchased online (see prices and versions of Windows 7).
