I downloaded someone else's content through the FileExchange. I then made significant changes to the code (I would say at least 90% of the original code is gone). There is still original content by the original author (specifically, the visual aspects - this is a gui project).
I've tried contacting the original author multiple times, with no response in 3 months (I received one e-mail at the beginning of me working on it, and nothing since).
So, if I want to submit this to the file exchange, what do I need to do to? Is just recognizing the original author acceptable?