Currently I've got an installation of Windows 7 Ultimate x64. I would like to downgrade to Windows 7 Home Premium x64 without a clean install. I've got a (legal) retail disc and tried the following tricks:
Trick the Windows version using a registry hack with all possible combinations
In combination with a trick to make an ISO with all editions
Still the Windows setup keeps telling me I can't upgrade because I've got a higher version installed (Ultimate). The trick seems dead. Does anyone know a way to change from Ultimate to Home Premium without the hassle of a clean install?
45 Answers
Windows 7 Ultimate is a superset of Home Premium, so no need exists to ever downgrade aside from licensing issues. You can change the Windows Components by going to "Start | Control Panel | Programs and Features | Turn Windows Features on or off" to remove those components included in Ultimate but not in Home Premium , effectively downgrading to the desirable version.
22It is possible and I have done it. I went from x64 RC (Ultimate) to x64 Professional RTM, from there to Ultimate via Anytime Upgrade now I am back to Professional. Don't ask me why I upgraded to Ultimate in the first place
Here's how I did it: You need your RTM files with the usual suspects (ei.cfg either removed or modified with the version you want to install, in cversion.ini file the minversion edited to sth lower than the current version, i have put 7000 there). Then in the registry go to local_machine -> software -> microsoft -> windows nt -> currentversion and set currentbuild and currentbuildnumber to 7100. Replace "Ultimate" in EditionID and ProductName with "Professional" (or whatever you wanna install or the name of a SKU lower than that).
Now you can start the Win7 Setup and chose upgrade. This way it is possible to "downgrade" your version of Windows 7 without the need to reinstall everything again!
Just Install right over it it is very easy get a cd pop it in and just install it using the "Customized" option while installing there it will ask you to select a partion either do the dual boot option (installing the other version of windows to a secondary partition) or install it on the partition windows Ult is already installed on. :)
Well, I really don't know...
What a friend of mine did was back up all his files and do a new install of Home Premium. Yes, i know this is a clean install, but you have all your files, at least. There is no other way (that i know of, and I know a lot) than a full drive backup and a clean reinstall of Home premium. In older versions of windows, you could use many different tools, but those are for older OSs. So just back up your FULL hard drive (on amazon, there's a lot of 250 GB+ Portable hard disks, use one of those. Backup takes a pretty long time, from 30 min (fast computer and USB 3.0) to 120 min. Buy a USB 3.0 for fastest results. You can install it using an ISO file (I recommend this) on a USB stick and choose boot from USB (newer computers can do this) or put it on a DVD and boot from that. I personally did this myself, I used an ISO file and a USB. I really don't recommend buying a Windows Installation Disk and choosing the "Customized" option, because it's kinda complicated unless you're a computer geek. I mean absolute geek. Sorry for being so long.
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You can install it using an ISO file (I recommend this) on a USB stick and choose boot from USB (newer computers can do this) or put it on a DVD and boot from that. I personally did this myself, I used an ISO file and a USB. I really don't recommend buying a Windows Installation Disk and choosing the "Customized" option, because it's kinda complicated unless you're a computer geek. I mean absolute geek. Sorry for being so long.
By ebai Emmanuel ewangi
