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HT1349: How to find the serial number of your Apple hardware product

Learn about How to find the serial number of your Apple hardware product

HT1349 I get an invalid signature message when trying to upgrade iTunes. How do I fix this?

204 Views 1 Reply Latest reply: Mar 18, 2013 11:35 AM by timothy.a.clifton RSS
twanger317 Calculating status...
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Mar 18, 2013 11:28 AM

How can I I'd the invalid signature when trying to upgrade iTunes on my PC?

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