You cannot run shaders on "Vanilla" Minecraft alone; you need a shader-compatible mod loader.
To ensure you are downloading a safe version, use the official developer pages: Download BSL Shaders here
Get the .zip file from one of the links above (do not unzip it). You cannot run shaders on "Vanilla" Minecraft alone;
Download directly from the creator at Capt Tatsu's BSL Shaders . Download BSL Shaders here
The standard repository for BSL Shaders on CurseForge . 🛠️ Quick Installation Guide