For that, you'll need an empty USB Flash drive that's at least 8GB. Unless you're just installing Windows 11 onto a virtual machine, in which case you can skip to step 19, you will need to create a bootable Windows 11 install disk from the data in your Windows 11 ISO file. Making a Bootable Windows 11 Install Disk A Windows 11 ISO file will appear in the folder where you placed uup_download_windows.cmd.