You could try a Manual Update.
Since we can't access your computer/modem figuration in this forum, the only ones that can do that are the techs. All we can do is report what has worked for other users in your situation. Many have temporarily disabled all anti-virus software (including modem) successfully. Make sure TurboTax and your return are on on your C drive to work properly.
Here's how to Contact TurboTax Support.
@ACitizen
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