Searching for "free" Windows license keys often leads to risky sites that bundle malware or "activators" with hidden backdoors [1, 3]. Instead of risking your data, you can use the official from Microsoft to install Windows 10 or 11 for free; it will run with minor cosmetic limitations without a key [2, 4].
If you choose to use the official WinBootMate , the license key is sent via a confirmation email after a one-time purchase. windows boot mate license key free link