A free utility tweaks the Windows ISO image file, thus letting you install whatever version matches your product key.

If you don’t have an external drive, you can also create a Windows 7 iso file on a PC using any number of free utilities.

To install Linux in VirtualBox on Windows 11, first download and install VirtualBox from the official website. Then, download the Linux ISO file of your choice (such as Ubuntu or Manjaro).

You will need a Windows 7 ISO file in order to proceed from here. This tool is best for those who have previously received an ISO file of Windows, and if you haven't, this will be a hurdle for you.