If you are interested in checking out what’s next in Windows 10 or want to help shape its future, you can join the Windows Insider Preview program. This lets you download preview versions of the operating system under development, install it, test it and give Windows engineers feedback about bugs, feature improvements or simply be on the bleeding edge.
Windows Insider Preview builds are not intended for production purposes since builds can contain experimental features and can lead to compatibility or stability issues. Always install on a spare machine, partition or in a virtual machine. See the following article about how to dual boot:
If you are running earlier versions of Windows such as Windows 8.1 or earlier, you might need to get into the Windows Insider Preview program by
downloading the latest Windows Insider ISO, which you can then use to
upgrade your system.