Yes. Microsoft allows you to install and use Windows 10 without a license key indefinitely. However, an "unactivated" version has two main drawbacks:
: A persistent "Activate Windows" watermark will appear in the bottom-right corner of your screen. can you download windows 10 for free
: Download this tool from the Microsoft site to create a bootable USB flash drive (at least 8GB required). can you download windows 10 for free
: You will still receive critical security updates, but you may miss out on optional feature updates. Ways to Get a Legal License for Free can you download windows 10 for free