Same thing here- tried it on two different days from two different PCs. Once I let it finish (let it run all night) and the resulting file was smaller than expected- and not surprisingly the install didn't work (couldn't open a file).

The non mega-version downloads and installs fine- now checking to see if it plays the games I've got. :)

Anyone know if there is a list out there containing which games are supported by MAMECE vs MegaMAMECE?