Windows 11 is available as a Free upgrade for existing Windows 10 devices running version 2004 and later. But this time Microsoft was very strict on Windows 11 system requirements compared to previous versions of Windows. The most notable change for many is the new requirement for a Trusted Platform Module (TPM), and secure boot. It also bumps the minimum RAM required to 4GB and it requires an x64-based processor, This has left a substantial number of PCs unsupported for the upgrade.
However, you can tweak the Windows registry editor to bypass the requirements for specific CPUs or TPM support, which allows most Windows PCs to upgrade to Windows 11.