I think this has been mentioned before. It looks like the Mac folder has issues. I delete them anyway.
Try right clicking on it and then Open with Winrar..
Close any warning notices and in RAR click on Tools and then Repair Archive.
It will then create another zip file; rebuilt.381243_TheSummerPiano_ChristianHenson.zip
Extract from that and try it.
Or get 7z which will tell you there is an issue but will extract what is there anyway.