To get a standard WIndows 10 or Windows 11 ISO is easy. For a latest public release ISO, just go to official Microsoft ISO download site, and download an ISO as told in this tutorial on our sister site Ten Forums:

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I am something you could call a Windows purist. I have never used, nor will I never use any third party tools, if a native Windows tool or command, or a free Microsoft downloadable tool will do the same. In this tutorial, I will show how to create a custom Windows ISO file using a free, native Microsoft tool.
1. Download and install WIndows Deployment Tools, a part of Windows 11 ADK, from Microsoft:
Download
2. In case you do not need Windows 11 ADK for any other purpose, just select Deployment Tools, and install:
3. Mount a Windows ISO as a virtual DVD drive, tutorial on our sister site Ten Forums:

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4. Edit the Windows image in ISO as you wish. Some examples about what you could do, tutorials on our sister site Tem Forums:

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4. When done, ready to create a new ISO file, open an elevated (run as administrator) Deployment and Imaging Tools Environment. You will find it in Start > All Apps > W > Windows Kits:
5. The prompt in Deployment and Imaging Tool Environment is unnecessary long (yellow highlight in next screenshot. Shorten it by jumping to the root of the drive with command
cd \
(blue highlight):6. Enter the following command to create an ISO:
oscdimg.exe -m -o -u2 -udfver102 -bootdata:2#p0,e,bd:\iso_files\boot\etfsboot.com#pEF,e,bd:\iso_files\efi\microsoft\boot\efisys.bin d:\iso_files d:\MyISO.iso
Change the path to your ISO_Files folder in above command sample (D:\ISO_FIles in this sample), location of the folder containing the files copied from ISO image mounted as virtual DVD (D:\ISO_Files in this sample), and your preffered path (storage location) and name for the new ISO file.
7. A new ISO file will be created:
8. ISO has been created:
8. You can now use this ISO to install Windows on a virtual machine, or copy its contents to a USB install media to use in clean installing Windows on a physical computer.
Kari
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