New textures and lighting effects to give the city a more modern, "underground" feel.
32 MB video card with DirectX 9.0 compatible drivers.
After downloading the mod files (usually in a .rar or .zip format), extract them into a new folder.
A common step for this specific mod involves copying the Audio folder from your original Vice City directory into the new Underground folder to ensure music and sounds work correctly.
For a visual walkthrough on how to set up the classic game and handle common Windows compatibility issues, watch this guide: