I did not have good luck with the BIAB download manager (it took forever and sometimes just hung), and I have a fast internet connection. I ended up downloading off their website one file at a time, which worked well. I also use Chrome. I did not encounter problems with messages about being corrupted, but one thing I've always wondered is why they don't provide some kind of checksum for these files, especially since BIAB runs with admin privilege. Maybe if you ask support they could provide checksums that you could use to decide if the files are really corrupt. You might also try one of the download managers that will break the file up, this one has a good reputation: freedownloadmanager.org
Good luck