It is primarily a cosmetic overhaul that integrates "Dark" and "Flower" themed wallpapers, icons, and cursor styles that go beyond the standard Windows 10 Dark Mode .
A significant drawback is that official Windows updates often break custom UI modifications. Users on platforms like Reddit have reported that subsequent updates can bork the entire OS, requiring a full reinstall. Critical Safety Warnings
Custom versions may have built-in security features like Windows Defender disabled or modified, making your system more vulnerable to external threats.
If you want a dark aesthetic without the security risks, experts from Privacy Guides and Microsoft Support suggest: Download Windows 10 Disc Image (ISO File) - Microsoft