Should you activate Windows? While it's completely safe to use Windows 10 or 11 without activating, I wouldn't suggest doing that because there are plenty of benefits to getting a licensed version.

No longer installed by default, you must first install the Windows 10 Projecting to this PC software before you can use it to create a second display using a wireless connection.

Microsoft will stop old Windows product keys from activating new Windows installs Windows 7 and 8 keys still seem to work for now, but that may be ending.