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Well, this is huge. I've always wanted to try these tools out.
"What is more, Quixel Mixer and Quixel Bridge are being made free to all, regardless of engine choice or license type. All Quixel Megascans users can expect more downloads per month and more generous license terms. "
https://quixel.com/blog/2019/11/12/quixel-joins-forces-with-epic-games