If you received EIC then your income would not be too high to receive the CTC, so that indicates you made an error when you answered questions about the child tax credit when you prepared your tax return. You needed to enter your children as dependents and you needed to answer the questions about letter 6419 correctly. If you answered correctly the other "half" of your CTC would have been on line 28. You can amend using TurboTax --not sure why you think you need to use a different software. When you amend pay very careful attention to the way you answer the questions for the advance payments and letter 6419.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
