Error code 605 means that the license code that you are trying to use is invalid.
It's invalid because it is linked to your TurboTax account and only your account.
You must sign in to your TurboTax account in order to install it. The license is limited to the one account you used when you installed it the first time.
You can reach TurboTax customer service at What's the TurboTax phone number?
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