This theme is no longer being developed and should not be sold anymore. This theme does not work completely with PHP 7.2 anymore. The plugins are also no longer up to date. The last update is two years ago.
Any of item updating is depending on item author. When he update is item you will received any mail about item updates.If you need any help you can ask to him or if you want to know when they updating their product they will inform you about updates.
You can ask your question at here as a comments