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I’m trying to downgrade Windows 7 from the Ultimate edition to the Professional edition. I followed the steps recommended about modifying the registry, but they didn’t work.

How can I downgrade?

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What steps recommended? What errors did you see? Your question as it stands is unanswerable. – nerdwaller Dec 8 '13 at 4:25
I modified the register changing editionID and product name from Ultimate to professional as mentioned in UNAWAVE solution . then start setup of the professinal windows but gave me that I cannot install. – Fernando Ricagno Dec 8 '13 at 4:46

In normally you can't downgrade a Microsoft OS to minor version but if you insist just follow this link, I just already test it in virtual machine and worked well. Downgrade MS OS

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i tried this solution , it didnt work – Fernando Ricagno Dec 8 '13 at 4:47
Are you sure you tried correctly all of steps and notes? because I tested and get answered in virtual machine. – Blue Moon Dec 8 '13 at 4:56
Yes , I followed then thre times correctly . My windows ultimate is build 7601 – Fernando Ricagno Dec 8 '13 at 18:21
I don't know why you can't get answered but i do install windows 7 ultimate with no any update no service pack and just follow the commands to downgrade to Home premium . may be you must first uninstall your updates ... i don't guarantied it's work after do this, it's up to you. – Blue Moon Dec 9 '13 at 7:57
How can I uninstall updates ? – Fernando Ricagno Dec 12 '13 at 1:31

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