Possible IE or FF didn't match the file extension properly. Open the settings and check the exact file name is EB1.1.exe and EB12.exe
If it works not after this change, check the size of the files, it is 786 MB for 1.1 and 108 MB for 1.2.
If it still doesn't work, I'll suggest downloading it per torrent (http://www.utorrent.com/ is a nice client), you get the needed files on our homepage.

XSamatan