Downgrading After Effects Files
Just like in Premiere Pro, After Effects is very weird about using files created in one version of the software with another version. Going from old to new is fairly painless. After Effects will give you a warning screen, saying that it is creating a new version of the file and that the old version will remain intact. Just click OK and re-save the project with a new name. Going in the other direction is where we run into trouble.