Is this a Addon?:

No, it is'nt - you have to install Animation Nodes 2.1 for this preset to work

if you are on a regular Blender (official) you want to use 

https://github.com/JacquesLucke/animation_nodes/releases/download/v2.1_testbuilds_2/animation_nodes_v2_1_windows_py36.zip for Windows

if you are on a nightly Blender use

https://github.com/JacquesLucke/animation_nodes/releases/download/v2.1_testbuilds_2/animation_nodes_v2_1_windows_py37.zip

Here is the complete Releaselist of Animation Nodes

https://github.com/JacquesLucke/animation_nodes/releases