I have 2.50.1 saved on my mac from the day it was publicly released that works fine for me. I just went to download 2.5.0, and after I did that I had the same problem I did downloading 2.5.2 and 2.5.3 RC1. It seems to me anything I download with the new Sierra mac os 10.12.1 (1682555) version corrupts the the Zelda classic install. It is good to know the issue is not with the builds, but with the install into the new mac OS X version. At least we know more than we did.