firmware 02.00.18 enable ssh

I'm italian and my english is very bad.
I have a my book world editon II tb with firmware 02.00.18. When I try to download new firmware from "http://192.168.1.50/auth/firmware_upgrade.pl?fwserver=martin.hinner.info/mybook/firmware.php" to enable ssh it find a new firmware, but when I try to install It says that It can't download it.
WHY?
thank's

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