how to download open gl 2.1
can i have link pls
becoz i m new to godot
Godot uses OpenGL ES 2.0 and 3.0. In terms of downloading GL, this is usually provided with your video card graphics drivers. What kind of computer and GPU do you use? You probably just need to update to the latest video card drivers.
Or if your gpu vendor doesn't properly support GL 2.1 then your last resort might be to use MESA software rendering driver. For windows a pre-compiled release can be downloaded from https://github.com/pal1000/mesa-dist-win/releases
You would need to extract the dll from there and place it in the same directory as the godot executable but I'd try updating gpu drivers first because software rendering can be slow.