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How many devices can my serial number be used on for Turbotax home & business? What if I only downloaded to 3 and can't download to another computer?

I have only used 7 of the 12 available returns, but it says my serial number is not valid for download onto a 4th PC.
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How many devices can my serial number be used on for Turbotax home & business? What if I only downloaded to 3 and can't download to another computer?

You can only use your TurboTax CD/Download license on 3 computers.