1.There are a few ways you can still get Windows 10 for free, without using a pirated license: you can install Windows 10 with a 7 or 8 key, or install Windows without a key—it will work just fine, save for a small watermark reminding you to purchase a license.

2.While you can no longer use the “Get Windows 10” tool to upgrade from within Windows 7, 8, or 8.1, it is still possible to download Windows 10 installation media from Microsoft and then provide a Windows 7,8,8.1key when you install it.. We tested this method once again on January 5, 2018, and it still works.

3.Windows will contact Microsoft’s activation servers and confirm the key to the previous version of Windows is real. If it is, Windows 10 will be installed and activated on your PC. Your PC acquires a “digital license” and you can continue using and reinstalling Windows 10 on it in the future. If you head to Settings > Update & security > Activation after installing Windows in this way, you’ll see the words “Windows is activated with a digital license”.

4.Microsoft hasn’t communicated what’s going on here, or whether it will block this method in the future. But it still works right now. Even if Microsoft blocks this trick in the future, your PC will keep its digital license and Windows 10 will remain activated.

5.Here’s the real secret: You dont need to provide a product key to install windows 10.  You can download Windows 10 installation media from Microsoft and install it on a PC, in Boot Camp on a Mac, or in a virtual machine without providing a product key. Windows will continue to work normally and you can do practically whatever you want.

Windows 10 will keep nagging you to activate it and won’t allow you to change any of the options under Settings > Personalization, but otherwise work just fine. It’s not something you’d necessarily want to do on your main computer, but it’s a very convenient way to set up a quick virtual machine, test Windows 10 on a PC, or install Windows 10 in Boot Camp. You can even pay to upgrade to a legal, activated version of Windows 10 from within your unactivated Windows 10 system after installing it.

This isn’t technically allowed by Microsoft’s guidelines, but they’ve specifically designed Windows to work this way. If Microsoft doesn’t want people doing this, it’s free to change Windows to block this in the future–and it might. But Windows has worked this way for years. This was even possible with Windows 7.