There are two ways to install the plug-in. Once the plug-in is installed you can create a new 'SnapSVGAnimator' document and publish like normal.
Adobe Add-Ons Portal
Install the plug-in from the Adobe add-ons site.
Manage Extensions Utility
External contributions can be made in the form of a Pull Request to the
More instructions on installing plug-ins can be found here.
Building Custom Platform Plug-Ins
To read more about building or writing your own Custom Platform Plugins for Animate go here.