You must remove the previous Oracle client version before installing the new version.
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Navigate to the Oracle 64-bit client home folder.
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Run the deinstall.bat file found there.
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Reboot the computer.
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Delete the Oracle 64-bit home folder.
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Navigate to the Oracle 32-bit client home folder.
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Run the deinstall.bat file found there.
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Reboot the computer.
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Delete the Oracle 32-bit home folder.