Minecraft Opti Fine vHD MT B for 1.2.3. If you want Shaders, install Forge for this version and use a mod (ex. ShadersModCore v2.0.1)
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Type in the modpack name ([1.2.3] Minecraft OptiFine) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select [1.2.3] Minecraft OptiFine from the list on the left. The launcher will handle everything else!