As stated above by TiffanyL: Error code 603 occurs when the product has reached its max activation limit. However, if you are trying to install TurboTax on multiple computers, it's the same as installing it on one computer. For more information, please see the FAQ provided below:
How do I install the same copy of TurboTax on multiple computers?
Since you continue to experience the same problem, even after following the troubleshooting steps, please click the link to contact TurboTax customer support for further assistance.
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