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This question already has an answer here:

Where can I get a legal, free copy of NXT-G for mac?
I lost my disk when I bought my NXT, and I need to get a new program.

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marked as duplicate by Zhaph - Ben Duguid Jul 25 '14 at 13:42

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.