windowscentral[.]com/software-apps/windows-11/what-is-dismtools-and-how-do-you-get-started-windows-11-and-10-image-gui-manager-explained
github[.]com/CodingWonders/DISMTools
github[.]com/CodingWonders/DISMTools/releases
[Click Assets for download links]
DISM is kinda a super duper Swiss army tool/knife for Windows. It's also a bit cryptic to use and there's not much in the way of comprehensive documentation -- mostly what you see online are various user-made tutorials on how to run scans to repair Windows files. Most users will not ever have a need to bother with it, but if you find yourself in a situation where it's suggested, DISMTool might make it a whole lot easier, as a GUI for the DISM tool. The Windows Central article talking about DISMTool gives directions on how to install it using winget, but DISMTool is also available as a portable version downloaded as a .zip file from GitHub.