If you plan to edit something for personal use, there's not really anything anyone can do to stop you, but, if you plan to redistribute in any way, remember the community of people you're in.  Most modelling artists watch releases (freebies and for sale) like a hawk, looking for something similar to theirs.  If even so much as 10 facets line up perfectly, you may not be in a legal quagmire, but you will be dragged through the mud, verbally and in screenshot form.

You could still be sued on top of that, should the artist in question have the  money to do so.  They don't have to win the lawsuit in order to bankrupt you with legal fees.

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.