Filter Plugin not working

[XDesertFoxXX]

Okay so I've been lost on how to install filter plugins for the graphics settings in this program. I've searched all over the internet on how to do it but I haven't been able to find a single article or post anywhere can anyone help?

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(there is nothing in the drop down box in the window)

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Also I understand this may be a really dumb question and I'm probably just missing something or being an idiot but I've been looking everywhere.

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Thanks in advance.