Shaders from rre36 ceased to exist in February 2014, but that does not mean that we pass them by. These shaders are not as good during the day but at night your world come alive and become super by realistinen. In General, shaders are very bright with good color and perfect for weak PC
Go to .minecraft/shaderpacks. If folder not exist, create it.
Move or extract shaderpack archive into .minecraft/shaderpacks. You must get following path: .minecraft/shaderpacks/YOUR_SHADERPACK.zip/shaders/[.fsh and .vsh files inside]
Run Minecraft and follow to Settings > Shaders. Here you can see all aviable shaderpacks. Choose one of them
Additionally you can enable "tweakBlockDamage", and disable "CloudShadow", "OldLighting"
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