MacBookPro 13" OS10.7.5 Have done 4 separate downloads over a couple of weeks, and get the same response each time I try to install. I have looked at help document and it has been no help. I currently do not have flash player installed. Tried to do the right click thing but show contents did not appear like Adobe showed. So I am stuck. Looked at response showing the mach kernel thing, do not know if that applies to me and seems beyond most average users of the computer. I am understanding why Steve Jobs stayed away from this mess. Thanks for any help you can give me.