Problems Downgrading from Windows 7 Ultimate to Professional

[fisk]

Hey there I'm currently using Windows 7 Ultimate 64 bit and need to downgrade to Professional.

I've followed the guide that was on this forum as well as many other websites about changing the registry entries which I have done, however my upgrade has failed and given me this message when trying to complete the upgrade: Your current version of Windows is more recent than the version you are trying to upgrade to. Windows cannot complete the upgrade.

I'm assuming this is because the registry editing isn't enough to trick the installation into thinking it is Professional.

Does any one have a solution or has run into this problem before?

Cheers
Fisk

 

[AddRAM]

Why ?

Just clean install professional.

http://www.sevenforums.com/tutorials/31402-clean-install-upgrade-windows-7-version.html

 

[Ztruker]

It may be complaining about the service pack level and not the product itself. Does the Pro DVD have SP1 included? If not download a legal copy from here: Official Windows 7 SP1 ISO from Digital River « My Digital Life

 

[gregrocker]

Always use the latest official installer after making sure Win7 has all of it's Updates completed, especially SP1.

 

[fisk]

Thanks guys, I did ask my Network admin for the SP1 ISO but I'll double check with him today. Else wise I should hopefully be able to use the ISO from that link with the companies volume user license, I'll report back later!