Best I can do is refund it for you. I occasionally get reports of downloadables not working for some people but since it's almost impossible to get any debug or error codes out of the crashes I wouldn't know where to even look to fix it.
It's not ideal but as a lone dev I have to accept that I won't achieve 100% compatibility. It bothers me a lot but there's only so much I can do about it.
I'll go ahead and submit a refund for you.