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Hello! I can't add this plugin. I've already tried everything, but it doesn't install. Can you help me?

Of course, could you provide some more information? What are the steps that you’re trying? Does the extension appear in the Extensions tab in Preferences? Do you get any kind of error message?

I duble clicked icon FX.aseprite-extension and select Install and click OK and after that I restart Aseprite, but it doesn't appear. 

Yes, it appears in the Extensions, but it doesn't appear in Edit > FX so that I can use it.

It sounds similar to an issue that others reported, you might find some help in this thread, summarised in this tweet, as well as this one.

Let me know if any of these help your situation.