You don’t need to uninstall 2024. The 2023 program won’t overwrite 2024. I have several different years all still installed on my computer at the same time. And the tax files are separate too. The tax data files end in .tax2023 and .tax2024.
Yes if you lose a program you can download it again from your Turbo Tax account. Since you now have to log into an Intuit Account all your downloads and licenses are listed there (even if you bought it from somewhere else) so if you need to download to install it again or install on another computer, even on the other operating system (Windows, Mac). And the download will always be up to date with all the updates.
