Getting the Addon

Download the addon
You can download the addon from the following URL https://www.dropbox.com/sh/u8fi2jdp1yo1xoy/AADgF-n2-YV-IZUkYPemzXnHa?dl=0 this link will provide you direct access to a list of all the files available for download.
Always make sure you are looking at the version for Atavism and downloading the latest version of the addon for that particular Atavism version.