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I don´t know, whether is defective driver (after install wifi light) or "only" Utility, but yes.
 
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I haven't experience with it. But, I have administrator account.

You go to /Applications/Utilities/Disk Utility. You select your partition (which is usually "Macintosh HD") and hit Repair Permissions! View my screen shot for help...
 

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Funny is that, now I can't not install this utility. I think that, bad appinstaller can be our problem. How can I reinstall internal "app installer" or know you some good alternative installer?
 
Funny is that, now I can't not install this utility. I think that, bad appinstaller can be our problem. How can I reinstall internal "app installer" or know you some good alternative installer?


I honestly don't know. If Installer works for other packages the problem is with the installed utility files.
 
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