Legallity with Allegorithmic Substance

Using a modified custom engine of 4.15 I started a game with Substance Atlantis as the base because the Substance materials packaged best when this project is the start:

When I package the project it even says Substance Atlantis. I’ll probably modify the package name but still just want to know if it’s ok to do. Is there a license fee to use Substance with 4.15?

Hello Mike,
How did you download the Substance Atlantis project? I click on the link but couldn’t figure out how to download it. The download button is greyed out and says “Not for Sale”.