A widespread issue during uninstallation is a popup error: "Entry Point Not Found – The procedure entry point ... could not be located in the dynamic link library." This suggests the uninstaller itself is broken or conflicts with newer Windows updates. You often have to force-quit the process or download a dedicated cleanup tool.
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The difficulty of removing this software is a good metaphor for why many users stop using online backup services in the first place. uninstall mcafee online backup