Update tutorial.md

Author: AllenDowney

tutorial.md

@@ -28,7 +28,7 @@ Here are instructions for each option.
 If you don't already have Jupyter, I highly recommend installing Anaconda, which is a Python distribution that contains everything you need for the workshop.  It is easy to install on Windows, Mac, and Linux, and because it does a
 user-level install, it will not interfere with other Python installations.
 
-[Information about installing Anaconda is here](http://docs.continuum.io/anaconda/install.html).
+[Information about installing Anaconda is here](https://www.anaconda.com/distribution/).
 
 The code for the tutorial works in Python 2 and Python 3, but I recommend Python 3.