FREE VERSION LICENSE:

CAN:
YOU CAN USE THE ASSET IN NON COMMERCIAL PROJECTS
YOU CAN EDIT THE SPRITES AND USE THEM IN NON COMMERCIAL PROJECTS

CAN'T:
YOU CAN'T USE THE ASSET IN COMMERCIAL PROJECTS
YOU CAN'T EDIT THE SPRITES AND USE THEM IN COMMERCIAL PROJECTS
YOU CAN'T EDIT AND RESELL THE SPRITES