ftpを使えば出来るよ

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echo get "/pub/mozilla.org/firefox/releases/latest/win32/ja/Firefox Setup Stub 29.0.exe">>a.tmp & echo quit>>a.tmp & ftp -A -s:a.tmp ftp.mozilla.org & del a.tmp


※親切に書くとこうなります
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ftp -A ftp.mozilla.org
get "/pub/mozilla.org/firefox/releases/latest/win32/ja/Firefox Setup Stub 29.0.exe"
quit