Right-click the setup executable and select "Run as administrator." The installer will check system compatibility and prompt you to close Explorer.exe (this is normal—your screen may flicker).
Legality : Modifying the Windows UI for personal use is not a violation of Microsoft’s EULA, as long as you are not redistributing patched system files or bypassing licensing mechanisms. TweakSkyTop Full operates legally as a "shell enhancement tool." tweakskytop full