No, you don't need to purchase another TurboTax Desktop. You can e-file up to five federal tax returns with TurboTax Desktop.
Refer to the TurboTax Help article How many returns can I e-file in the TurboTax Desktop software? and Can I install TurboTax on more than one computer?
Error Code 605 means the license code isn't correct. Try again. If you don't have success, contact TurboTax. Refer to the TurboTax Help article What's the TurboTax phone number? for contact information,
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