Up until now, one of the ways to download Windows on Arm ISOs was by becoming a Windows Insider. Since the ISOs were available only as VHDX files, you could only use them on virtual disks for virtual machines like Hyper-V, but not on physical Arm hardware. Alternatively, you could also get those ARM ISOs through third-party sources like UUP dump. However, with the latest Arm64 ISO release on Microsoft’s website, you no longer have any limitations that you faced previously and can feel confident that the ISOs are legitimate and secure.
Now that the first-ever Arm64 ISOs for Windows 11 24H2 are live for everyone, you can download it directly from Microsoft’s ISO download page and install it directly on Arm hardware, just like how you do for x64 versions of PCs.
Which of course does go to show that Windows 11 could actually install on your more powerful PC or laptop that has no TPM chip, or a TPM v1.1 or whatever. But depending on what you really want to use your ARM device for, you may well still be better off installing a Linux distro on it because there won’t be any future restrictions on updating it, and it will probably be lighter to run on that hardware.
See https://www.xda-developers.com/microsoft-releases-windows-11-24h2-arm64-isos-for-direct-download