I installed a custom component (managed package) from AppExchange but I don't see it in App Builder for a App Page.
Can I solve this problem? Thanks.
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It seems to be an open source reusable component that you can include in your apps via code (look at this sample). but the component is not implementing any of the interfaces by default to enable it to be used in the app builder or lightning actions or community builder etc..
you can edit the component code in your org and make it implement the interface flexipage:availableForAllPageTypes for it to appear in the App builder..
you can go thru this article for details on how to enable components for App builder.