It is odd as @nicdark is a very experienced and respected author and this item has a near-perfect rating.
What makes you think the plugin no longer exists? The error you mention in the comments does not mean that. If you have the source files for the plugin then you should try manually installing it.
There was a theme update a few days ago - presumably, you are using the latest copy?
I can see you have already commented on the item - support can be slower over weekends but I would be very surprised if the author does not come back soon.
You can request a refund using the link above but I suspect that there is an easy fix to this.
Thanks @charlie4282 for your words. @hernanpaz don’t panic, our support team don’t work on saturday and sunday so you will receive your answer on monday as soon as possible. However don’t worry the theme works fine, otherwise it wouldn’t be for sale on the market. For sure you have an old version of the theme, simply download the last version and you will find all plugins required for the installation in the plugins folder of the theme.