Hi! The license guidelines for this products can be found here: https://graphicriver.net/licenses/terms/extended
Do mean scaling it up? It should scale correctly at 200%, 300%, and 400%. 150% however will give poor results. If you are using photoshop or something similar, make sure interpolation is set to "Nearest Neighbor" when scaling, otherwise you'll end up with blurry pixels. Would you like me to include scaled versions in the zip?