Try downloading the second one, Pablo, and compare the sizes. As Cheyenne suggests, it's the larger of the two you need. Also, somehow, it could be the Mac is "damaging" the file, causing the eDGe firmware to reject it as a valid update.zip.

If you're still sure you have the right one, then download the link on your eDGe directly from the original page/link. Copy it to the plugged in USB memory stick and rename it to update.zip and then try the update process.

One last thing to do - log into your enTourage account and opt-out of the Ermine beta. It's the same process you used to opt-in, just now the red text will say you're participating and offer you a way to opt back out.