Teegrins,
Bellaluna!
To make sure you have the correct links, they are available here:
Also make sure to download the files corresponding the region of your account/regular client. Not saying this isn't clear to you, but it will not work with the wrong files, so I think it's worth noting. ^^
As for the files getting corrupt, if you use a download-manager, try a different one, or none at all (browsers these days do provide their own managers so I doubt anyone really uses any external ones any longer... methinks).
If possible, try downloading the files to a different location. Preferably a different physical drive (hard-disk), or at least, a different partition. In case this produces different results, it might be worth running some checks for errors on said drive(s) (chkdsk, and the likes), thinking of getting a replacement, or at the very least, creating back-ups of important files as soon as possible. Though this does not necessarily mean the drive is going/has gone bad, it's
never too early to back things up.
By the by, does it always seem to have been corrupt at the same point of extraction?
Have you experienced any other corrupt downloads recently?
Any other connection issues?
Just some thoughts for now!
Good luck~