Schonmal bei Apple geguckt? ;)
Suche in den Downloads:
https://support.apple.com/downloads/iweb
v3.0.4: http://support.apple.com/downloads/DL1413/de_DE/iWeb_304.dmg
https://support.apple.com/downloads/iweb
v3.0.4: http://support.apple.com/downloads/DL1413/de_DE/iWeb_304.dmg