TurboTax free edition is for simple tax returns (1040EZ/1040A) with standard deductions and if you didn't select any add-ons or upgrades. If your return is more complex you will not be able to use the free edition.
Please see this TurboTax FAQ:https://ttlc.intuit.com/questions/1899480-why-am-i-being-charged-for-turbotax-free-edition
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