If you forget this step, I cannot help in any way. Provide a screenshot or video if you can.

I can't help you if you don't provide these details: If you are using this mod on a Mac, I'm sorry to say that I am powerless to provide Mac support. If this mod is giving you unusual results, please make sure that you installed everything correctly first. 'ON' gives more responsive input and more steady fps, but likely lower maximum FPS. When OptiFine is installed, try toggling 'Options > Video Settings > Performance > Smooth FPS:'. Run the game in a smaller resolution in full-screen Once the mod is properly installed, there are a few things you can do to ensure maximum performance. Physically-based specular highlights from sunlight Vastly improved performance with long render distance settings Screen-space shadow tracing for better contact shadows Normal/bump mapping from torch/artificial light New atmospheric scattering on distand land for a natural sense-of-scale Accurate ambient sky lighting from atmospheric scattering via Spherical Harmonics Accurate sunlight color via atmospheric scattering Completely reworked system for day/night cycle based on atmospheric scattering Make sure to always use the latest version of OptiFine! Check the links at the very top of this post to follow its development! SEUS Renewed is a re-imagining of SEUS and is an ongoing project. Here you can choose from Low, Medium, High, Ultra, and Extreme profiles, as well as tweak any individual option to suit your needs! Click Shader Options in the bottom right corner of the Shaders selection screen (for v11.0 and Renewed) to setup SEUS-specific options. In Options > Video Settings > Shaders, make sure that 'Old Lighting' is set to Default!ħ. Shaders Mod Is In an early version of Minecraft known as GLSL Shaders Mod.6.

Minecraft shaders texture pack 1.7.2