Hi @omid020,
Regarding the install button, we’ve seen this bug before with Superfly specifically. Sometimes when the developer pushes an update the plugin zip folder extracts with additional characters after the plugin name. This causes WordPress to see it as a different plugin so it doesn’t appear “installed”. Unfortunately we can’t do anything about it until it’s updated by the developer. I can confirm it is installed after checking your site.
As for the Purchase Code, this would be the CodeCanyon purchase code if you bought Superfly directly on CodeCanyon. Because you received it as part of X, you wouldn’t have a code to register directly. This is not a required step however. You don’t need to activate the plugin because X will provide automatic updates for you.