[RSS Feed/News] Addon Won't work, Won't Install, How do I remove it?

[XenForo]

I tried to install an addon. I uploaded all of the information, and when to my Admin CP, and tried to install it. I get an error, so it won't install. However, it's still on the list of Installable add-ons, with the INSTALL button there. I'm afraid to just delete it via FTP. Can I do that? How can I get rid of it?

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