Cannot install signed apk to device manually, got error “App not installed”

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You may be using the android 5.0 or above device.

May be your development version is not uninstalled properly.

Try this,

Just go to the Settings –> Apps –> Click on your App. —> In App info page at the action bar menu there will be an option called ” Uninstall for All users “ click that. Your app will be completely uninstalled and now you can try installing the new version with no issue. Hope this will help you

NOTE : This is for lollipop and above.
Refer the screenshot attached.

Complete Uninstall for Lollipop and Above

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