This might what you need from Lego 

How can I obtain a replacement
for the LEGO MINDSTORMS NXT 2.0 software for set 8547?


http://en-us.kb.lego.com/ics/support/KBAnswer.asp?questionID=2655 [3]


On Sun, 21 Oct 2012 19:22:55 -0400, Purnima wrote: 

> Does anyone
know if NXT Software is available online for download. 
> 
> Regards, 
>
Purnima 
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