As I mentioned in my earlier post, the compatible file type is .8bf but with the caveat that many don't work (for a number of reasons, among which new developments Adobe Photoshop underwent and the use of 32- and 64-bit versions).
The number of effects available is quite overwhelming so I'd suggest you initially limit yourself to a few effects you're after (e.g., the art filters), do some Googling, download some freebies and/or trials, and start experimenting with them. Trial & error is how you learn to use plugins.
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