Unity 3d game development hotshot corrupted files

Hey guys I downloaded the the unity 3d game development hotshot and they sent me a link to download the support files from but it’s not working everytime I download the files my pc tells me they are either corrupt or damaged. Anyone had that problem before?

Consider trying a different zip program (7-zip, WinRaR, WinZip etc) to check if another program is able to open the file. Otherwise contact packtpub or the author to get the file fixed, or provide instructions about how to go about.