Introduction:
This tutorial will install OptiFine 1.5.2 HD U D3 and Sonic Ether's Unbelievable Shaders (SEUS). Credits to Twilight Angel over at http://www.hexxit.org for the bin.
Downloads:
Bin Archive:
http://www.mediafire.com/download/swzcakyk4v773x3/bin.7z
SEUS Archive:
http://www.mediafire.com/download/u3oitwu7gr21ab1/SEUS+v10+RC7+Ultra.zip
Step 1:
Navigate to the hexxit directory
%username%AppDataRoaming.technicmodpackshexxit
Now extract the bin.7z archive with 7-Zip (Free @ http://7-zip.org/) or Winrar in the hexxit directory above, it will replace the bin folder. Click yes if prompted.
Step 2:
Whilst still in the hexxit directory, create another called "shaderpacks" and drop the SEUS ZIP archive inside it.
Step 3:
Launch hexxit via technic launcher, start or load a world and open the menu via ESC. Click on shaders, then SEUS and wait a moment before clicking the done button. Congratulations.
Result: