With the bundle downloads it's kind of hit and miss situation if you want to watch them before the bundle is complete.

As i've mentioned earlier, the way BT Downloads isn't from beginning to end, it's chunks in random order. So you could end up downloading bits of one episode, then bits of another episode, then more bits again for the first episode, etc.

So you can keep trying if you want, or simply wait until the bundle is complete in which case you would definitly be able to watch them then.

If you want to watch them so fast, you should download via HTTP with a download manager for pausing and resuming, or FTP with a pause and resume function, or with BTorrent downloads that are of each single episode rather than bundles.