those things you listed are the things i tried and none of them fixed the issue. I have OSX 10.12.4
You could try to download the zip again in case it's some rare situation that it got messed up somehow. Otherwise, it sound like a permissions thing to me. When you performed suggestion #4, did you get some kind of confirmation that the command was executed? I don't own a Mac myself though, so I hope some Mac user will be able to chime in.