How to Enable Dark Theme in Windows 10
You can use registry settings to enabled Windows 10. Just create two registry entries and you are done.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize
create a DWORD value named “AppsUseLightTheme”
with the value of “0”.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize
create a DWORD value named “AppsUseLightTheme”
with a value of “0”.