Windows 2024 Delux Fed+State won't let me save

I bought the 2024 Delux Fed+State at Costco today. Downloaded and installed it on my Windows laptop. Transferred 2023 data into it. Finished some personal data stuff. Before I start to enter data I tried to save the file. It just wouldn't let me save, kept saying the file did not exist. Tried to change file name, use "save", or "save as", none worked. I had to exit without saving. Now I have to restart and transfer 2023 again. I don't know how I should proceed at this point.

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