Does the sildurs shaders resource pack cost money?

I have a question about Minecraft:

Does the resource pack "sildurs shaders" cost money or can it be downloaded for free? Do you absolutely need Optifine and is the site confidential? Maybe you can link one to me. Do you get any damage from this?

For shaders you need Optifine, and sildurs shader is free

Nope, free after you've downloaded Optifine (also free as far as I know…)

You absolutely need optifine, but you can easily download it for each version, but the shader is free.

https://optifine.net/.../downloads