I know how frustrating it is when something doesn't work right. But....there has been lots of people download the exact same files you are trying to download, from the same server, that has not had a problem at all using the files.
I know others have stated that they have had problems with the files too. But the bottom line is...if they files on the server were corrupted...then all of us that have downloaded them would have corrupted files but we don't.
I downloaded the files using my phone as a hotspot...and using Free Download Manager which by the way seemed to really speed up my downloads of the files.
I do hope you get the problem resolved...and I'm sure the guys at CW will do what they can to help you get it resolved.