Switching from Ultimate to Professional without reinstalling ?

the issue is

Windows can't copy files necessary for the install. files might be corrupted or missing. Verify that all the files necessary for the install are available, and restart the install. error code　: 0x80070017

You'll need to confirm the ISO or download another, burn to DVD with ImgBurn at 4x speed, or try writing to flash stick with Universal USB Installer.

You can extract the ISO to desktop to run Setup as Admin, however you'll need to have a known-bootable System Repair Disk for rescue purposes.

my dvd was dirty i retried but i think i'll have to reburn it.

gregrocker said:

You can change between retail versions with the popular workaround many beta testers used to change from the RC to a retail version.

Change the two registry keys shown below to Professional exactly as they are typed, which tricks the installer into thinking it is doing a Repair Install which is always allowed:

Attachment 96355 (click on image to enlarge)

Next run the Professional Installer from desktop, select "Keep Connected To Internet" to get latest drivers and updates into Installer, then "Upgrade". You will have to reactivate afterwards with the Professional Key, but activation is reset anyway in a Repair Install.

I tested this about two weeks ago successfully from Ult>Pro after reports it wasn't working. Another Guru also found it to work then.

The performance reported by many who tried it after Win7 release are the best reports ever on in-place Upgrade, completely contradicting MS claims that beta code couldn't be upgraded. Two friends of mine who I did the RC Upgrade to retail for via Remote Desktop don't even want the promised clean install now when I come to visit.

Hi is this also possible to upgrade from Win 7 Enterprise to Windows 7 Professional N ?

I tried this method but when i click on update he says its not possible to upgrade from enterprise to Prof N onlöy to make a new copy.

So I probably did something worng.

Do I still need to write Professional in the Registry or Proessional N now?

I doubt if Enterprise can be used for workaround because it is engineering differently.

Hi Greg~ I'm not sure you're still here as this post is very old.

I'm trying to downgrade from Ultimate to Professional, and I used the instructions and followed to a T. (Here is also a picture of what I've typed into my registry.

https://i.imgur.com/JPEWYJS.png

I still get the error that I can't upgrade from Ultimate to Professional when trying to upgrade from my disk. Will this work if I'm on the "trial" version? (I didn't know which Windows I had when I reformatted my computer just recently, so I click ultimate and to register the key later. Come to find out the key was on the side of my computer the whole time, and it was professional)

Is there something I'm doing wrong?