I have character animate preview1 automatically with my creative cloud subscription, but I am trying to find where to download preview 3 so I can use the more intricate functions of the program.
Character Animator is installed with After Effects. There is no other way to get it.
If you have After Effects installed, go to File/Open Adobe Character Animator
As JJerryK said above it comes, with After Effects, so if your version still says Preview 1, try updating After Effects via the Creative Cloud.