Home and Business 2024: won't update, won't uninstall, won't reinstall

After completing all federal data entry, TT wants to update before continuing, but gives Windows message 1603(?). turned off all protection, did not work. Tried a manual update, got "Another Version" message; did add/remove option and removed all TT products for years back, did not work. Used a third party removal app and deleted all TT, did not work. Used \w_perrelsuperpatchIS_ttax_2024.exe, says installed successfully but can't re-start TT as some set-up files are missing and must reinstall using a new setup, but I can't because of the previous version.

All of these steps have been attempted numerous times, all ending in the same loop of failure.

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