You have the ISO file (either a legitimate Insider build or a verified leak). Now what? You need to create bootable media. Do not just double-click the ISO inside your current Windows if you want a clean install.
If you find a file called "Windows 12.iso" claiming to be a "Final RTM" (Release to Manufacturing), it is 99.9% fake. If you find an "Insider Preview" or "Leaked Dev Build," it might be real, but it is highly unstable. Windows 12.iso
Ensure that you review the "Privacy & Security" settings to control what data is sent to Microsoft. You have the ISO file (either a legitimate