To properly delete the application from your Mac, do the following:
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Open a terminal and type mdfind -name "application name"
where you replace application name with the name of the app.
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Once it finds some results, use rm -rif PATH
where PATH is the path per line it displays from the command above.
Note: You might have to use SUDO in front of each command to give the command exclusive access. When it finishes, reboot the Mac and the app should be deleted.