1.16.3. Sunflawer 0.4.1 Lightshaft Update. 1.16.3. Oct 20, 2020. CurseForge Sunflawer Shaders - Minecraft - CurseForge
Drag the downloaded .zip file into the folder that opens.
Engineered to be playable on almost any GPU, making it a "low-lag" option for high-end visuals. How to Download and Install for 1.19.x