Yes, you read it right. Now you can install any edition of Windows 7 from any Original ISO. You do not need to buy different DVDs for each edition of Windows 7. Every windows 7 DVD contains all the editions of the Windows 7(Home Basic, Home Premium, Professional, Ultimate).
If you have DVD of Windows 7 (any edition), you need to create of ISO of it. To prepare ISO of DVD, you can use any DVD ISO MAKER software. I generally use MINIDVDSOFT’s Free DVD ISO MAKER software to prepare ISO of DVDs. Once you have created ISO, lets move to the next step.
Now using UltraISO or MagicISO, you can edit the ISO File. You have to browse to “SOURCES” folder. Look for the file “ei.cfg”.
The contents of the file will be depending upon the edition of the Windows 7 ISO you are using.
Contents of the file will be: -
I am using Windows Ultimate ISO, that is why [EditionID] has the value of Ultimate.
Now you just have to change this value. Possible values are : Ultimate, Professional, HomePremium , HomeBasic.
Write any one value out of these according to your need.
Another Method is just delete the “ei.cfg”. During installation setup will ask you to select one edition out of Ultimate , Professional, HomePremium, and HomeBasic. Go ahead with your choice.