You can download the latest version of (often referred to as "Naelego's Cel Shaders" or similar variations depending on the specific pack you are looking for, as "Shildur" is often a typo for the popular BSL Shaders or Sildur's Shaders ) from the official Sildur's page here:
Shaders will not work on standard Minecraft. You need a mod that handles the lighting engine. shildurs shaders