Microsoft allows you to use Windows 11 without activating it. While you will lose personalization options (like changing themes or colors) and see an "Activate Windows" watermark, your system will function, and you will receive essential security updates. Conclusion
If you cannot purchase a license, you can still use Windows 11 without activating it. Microsoft allows you to install and use the OS with some limitations: windows loader windows 11
To grant attackers remote control over your PC. Ransomware: To lock your personal files and demand payment. Microsoft allows you to use Windows 11 without activating it