Only download from reputable community sources. If you haven't downloaded it yet, consider using the official Microsoft Media Creation Tool instead for a guaranteed clean install.
Restart your PC and tap the Boot Menu key (usually F12, F11, F8, or Esc) and select your USB drive. windows-all-editions-aio-66in1-x86-x64-update-januari-2021
These AIO disks usually do not include licenses. You will still need a valid Product Key for the version you chose. Only download from reputable community sources