I called TurboTax support and was pleasantly surprise how quickly I got through to an actual person. She spent the time to walk me through several attempted solutions. None of them fully worked but I got some ideas of other things to try.
After uninstalled and reinstalled TurboTax 2023 in the default folder, C:\Program Files\TurboTax\Individual 2023 without solving the problem, I uninstall it one more, created the directory C:\Program Files2, and then install TurboTax 2023 in C:\Program Files2\TurboTax\Individual 2023. After this installation in an alternate location, updates smoothly installed, TurboTax 2023 comes up, and I'm successfully able to open my tax return file.
Some time I should probably try figure out what's wrong with the C:\Program Files directory tree, but now that I have TurboTax 2023 working via my work around, I need to focus on completing my tax returns by the Oct. 15, 2024 extension deadline.
