The short answer is no, downloading Windows 10 for free is not legal or recommended. Microsoft, the company that created Windows 10, offers the operating system for purchase on their website or through authorized retailers. However, Microsoft may offer free upgrades for users with eligible devices or for a limited time. It's important to note that downloading Windows 10 illegally through unofficial sources can put your computer and data at risk. Additionally, a licensed version of Windows 10 provides access to security updates and support, which is important for maintaining a safe and stable system.