Is downgrade supported at installation time, it works.

I install w7 ultimate (go to a .wim file, with a file of responses without product key), updated everything that needs to be updated, and then, at the moment, I add my product key (key for w7 Pro) with the help of 'Change product key' in the control panel-system.
It works fine, but is it supported?

A Windows 7 Professional product key cannot activate or decommission an installation of Windows 7 Ultimate.

You must have a disc of Windows 7 Professional, and then perform a custom installation:

For 5 years, Microsoft made it fairly easy for users of the Windows 7 operating system to get reinstall media. If you have lost your support disc or installation retail collection; either it has been damaged or defective; You can download a copy of the edition that you have licensed from a membership site called Digital River. More recently, Microsoft ended the availability to reinstall media that you can download as a. File ISO in Digital River, which is a digital reproduction of an optical disc.

It was particularly convenient for people who could not easily get the manufacturer's recovery media, did not want to pay the fees required to get or preferred a clean configuration without the software packaged manufacturers or even a recovery partition does not work. It's easy to use, all you had to do was reinstall and reactivate using the product key located on the certificate of authenticity and download all the drivers on the manufacturers website.

Given that this option is no longer available, what are your options? See the article for more details:

How to: What are my options for Windows 7 reinstall media?

Make sure you scroll down and read the section:

What to do if you cannot get your manufacturer recovery media, refuse to use or to buy it or the Microsoft Software Recovery Website does not work?

How to: perform a customized Windows installation

Tags: Windows

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