Need advice after repeated failed downloads


i had downloaded 11.2 64bit by bit torrent using free download manager in win 7.but it came out with 3.x GB of DVD iso.but it shows me 100% download.i wrote it in DVD.tried to boot by that DVD.worked will some point.but it was taking too long time to install,so i did not install it.And i gave up.

So direct link is a good option.

But the OS and filesystem could not be a problem,i think so.