already includes many of these high-resolution assets and improved physics by default. Manual Activation
Troubleshooting:
If the option is grayed out, delete or rename DisplaySettings.xml in Documents\Sleeping Dogs\ and relaunch. Official Sources
Understanding the High Resolution Texture Pack already includes many of these high-resolution assets and
A patch was released early in the game's lifecycle to ensure HD textures are enabled by default. If your game feels "blurry," check these settings: Understanding the High Resolution Texture Pack A patch