I have a similar problem. I have the software and my 2018 tax file. I can not open the file. The program asks for my password. I do not know what it is, so I select the option that asks me a question to recover the file. The question is very simple. It asks me for the last 4 digits of my SSN. I type them in and the program responds, INVALID ANSWER. I can't seem to get an answer from turbo tax either. I had to start from the beginning to file my 2019 Turbotax. Now I have just received an email advising me about a possible $500 credit that may be available to me for the 2018 taxes that would require me to submit a amended return. There's only one problem. I still can't open my 2018 Turbotax file.
