To make sure the file hoster can't check inside the files for copyrighted material or that if someone take his links and post them as his own, his username is in the files so they know they aren't his.what's the point of placing a password and posted publicly.
What's the exact error message you're getting? If a file is corrupt it tells you it might be a wrong password or something else(since it can't tell the difference unless you use the very latest form of compression).
Click on a link, download the file, repeat until you have all the parts. Nothing to pay at all, there's always a free option.Who can teach me how to download the files on this website? Do I have to pay for a premium?