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Helpful answers
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May 19, 2012 6:02 AM in response to Kleinrathjby Carolyn Samit,Hi...
Try here > Mac App Store: "An unknown error occurred (100)" when purchasing
If nothing from that link helped, install the OS X Lion Update 10.7.4 (Client Combo)
That will reinstall the App Store for you which may help the error messages. Restart your Mac after the combo is installed.
It's ok to do this regardless of whether or not you already have V10.7.4 installed.
If you still have problems, if you have anit virus software installed, disable that.
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Dec 11, 2012 2:31 PM in response to Kleinrathjby mokho,I have the same issue. Interestingly I tested with some puchases. Both free and charged apps were easily downloaded, but Logic Pro download gives me the error 100 that I can't get around.
That's a $200 revenue loss for Apple and I'm surprized there is no help on this.
Thanks,
-Mohsin