2023 tax file missing after extended search through hard drive

I know there are several posts about this problem, encountered by me when I installed the 2024 TurboTax premier program and it could not locate my 2023 tax file that was created on last year's program. And yes, when I open last year's 2023 TT software (which is still on my computer), my tax files from last year are entirely missing and I can't amend that return or even look at it through the TT software, though it was filed by TurboTax through that program last spring. 

 

I then looked for the tax file (searching through my entire hard drive for .tax2023 and *.tax2023), and nothing was found. (I kept a pdf of course of my 2023 tax return for my records, but the TurboTax file is just gone.) There are many carry forwards and other data from last year's return that I need to have the 2024 program load from last year's filing, so this is important to me. I've been using TT software for several decades and this has never happened before. 

 

Needless to say, this is confounding and annoying, and TurboTax owes me and everyone affected an explanation as well as a serious effort to address the problem. I sense from what has been written that some update in the TurboTax software may have deleted or hidden last year's tax file, but I can't possibly know why my last year's TurboTax file has disappeared.

 

Thanks for any solutions to this problem that work. While I've viewed a lot of activity on this site about this issue and have tried a number of the leads described, I don't see anything that resolves it. I fear my TT tax files for 2023 are just irretrievably gone.