If you have a legitimate Windows 10 license (even from an old PC), the Windows 11 upgrade is still free. Microsoft never officially closed the free upgrade path. Use the Installation Assistant to upgrade while keeping your activation.
Tools like are open-source, have been audited by the community, and are widely regarded as less malicious. They use the same KMS principle but without bundled malware. Even then, Windows Defender will flag them, but the code is transparent. solidsquad activator windows 11 work
This means: