It looks like the original PDF linked, https://www-cdn.anthropic.com/53566bf5440a10affd749724787c89... is 404.

I do see these:

https://www-cdn.anthropic.com/8b8380204f74670be75e81c820ca8d... https://www-cdn.anthropic.com/79c2d46d997783b9d2fb3241de4321...