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I have installed the retail version of the NXT software. Due to pitiful performance on my Mac (OSX 10.7 Lion) I followed guidance on other forums and uninstalled Flash 11 and reinstalled 10.

Now when I start the application, I get the following error:

enter image description here

I have read on one site that a patch is necessary, but the linked patches are for the EDU version of the software as opposed to the retail version (I guess?) so they won't even install properly.

Any suggestions are most welcome. I see that there are other alternatives out there to program the NXT, but frankly for the cost of this product, this software should just work. (Lego, I hope you're listening.)

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    I'm in the same boat. 10.7.5, retail, file broken 1003, tried the patch, even uninstalled everything, reinstalled from ISO, and tried the driver and tried the patch. Nada. I was really hoping the answer wouldn't be NXC. I'll certainly try that, but I guess I'll call tech support Monday. Ideally I'd like to use NXT-G like everyone else. This is lame.
    – Jesse
    Commented Dec 15, 2012 at 23:25
  • Jesse - I'm in the same boat as well. See my comment under "There are a number of Mac patches". I had hoped to be able to use NXT-G on this Mac... this is really irritating. WHY doesn't it even give the FILENAME of the "required file"?!?!?
    – pbr
    Commented Jan 6, 2013 at 4:57
  • Yep. Same boat. Lego software has always been spotty, so I guess I'm not surprised. Kid is bummed, though.
    – DA.
    Commented Mar 18, 2013 at 22:14
  • Note: LEGO does not sponsorize, endorse or probably not even read this site, so saying things like "LEGO, I hope you're listening." is pointless. If you want LEGO to listen, you best bet is always to speak to them directly, via their customer service.
    – Joubarc
    Commented Mar 22, 2013 at 8:55
  • I'm in the boat too, my mindstorms has been like this since early june. Tried tons of sites, never worked. Re-downloaded it 4 times, and tried different downloads 7 times.
    – user3075
    Commented Nov 8, 2013 at 2:34

3 Answers 3

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Here we go. I was browsing around looking for answers when I stumbled upon this thread: https://discussions.apple.com/thread/4158314?start=0&tstart=0

One person mentioned Lego tech support sent him a link to an ISO. It looked like maybe it was a newer ISO than the one I was using, so I tried it: http://dl.dropbox.com/u/31950731/MINDSTORMS%20NXT%20Retail%20MacWin%202012-06-21-1305.iso

It worked great! No patches, no nothing. Just installed that, restarted, and suddenly I have NXT-G working on Mac OS X Lion 10.7.5. Word.

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    Although I would point out that dropboxes can disappear at will, so this link may not be around forever - and as this isn't coming from an official source (mentioning in a chat room that it came from LEGO tech support is not the same as getting it directly from them) - so please ensure you have up to date Anti-Virus software in place before downloading and installing any file from the internet.
    – Zhaph - Ben Duguid ♦
    Commented Dec 17, 2012 at 10:31
  • This seems promising, but yea, LEGO linking to their own software via dropbox seems a little suspect.
    – DA.
    Commented Mar 18, 2013 at 22:15
  • The second link gives me an HTML 404 error. 😕
    – mindstormsboi
    Commented May 21, 2020 at 11:03
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There are a number of Mac Patches available from official Mindstorms support site:

Mindstorms Support > Files > Patches

They include:

  • Software 2.0 Fix (Mac)
  • Snow Leopard Fix
  • MAC Leopard Fix

The interface isn't all that obvious: Mindstorms Software Support

First, click on the file you wish to download from the carousel, then click on the big "Downloads" button, you should then find a link to the appropriate downloads:

enter image description here

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    Thanks for this. I've applied these patches, and that's when the errors actually started. I think I've found the way forward here, the NXC environment: nxc.ruby4kids.com/nxc-language-reference. My son is still a little young for even the graphical IDE, so the raw programming environment is perfect for us.
    – jn29098
    Commented Aug 5, 2012 at 2:46
  • I just installed the latest NXT-G2.0 on Lion - 10.7.5 - and it was REALLY borked - wouldn't resize right, threw random errors, generally almost worked but not quite. I would resize the outer window, and the program area would get smaller! Then I installed the "Software 2.0 fix (mac)"... and now I see "Error: a required file is broken" - it's even more broken.
    – pbr
    Commented Jan 6, 2013 at 4:51
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Having recently ran into this issues as well on OSX (10.6) here's the solution that worked for me:

  • Uninstalled Flash completely
  • Re-install the NXT software from the CD
  • launch and run

Apparently, only the version of Flash that was used when they developed the software is the one that will work with it. It gets installed with the software if it's not already installed.

That does mean you maybe want to create a separate user account just for running NXT so only that has the older version of Flash.

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