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Have you tried a complete uninstall of what's currently installed? I'm assuming your database version is 2016 right and the bits on your machine are for 7.8.3? You might try a complete uninstall if possible then just install 2016. If that doesn't work, you may have to try to rip out what you can from the registry. Not optimal, but it may work if the uninstall fails.
Once again you have rescued me and I so deeply thank you. Yes I cleaned up the registry and installed the 2016 successfully.