Hello Wrekk
The Island Set is right now not available. Its in the submission process to the marketplace. I am making the adjustments to it to get all the final improvements in.
However my first set AutoLandscapeAlpine is available right now see this link.
https://www.unrealengine.com/content/060bdb4a48334b1d9cf3b430710e477d
The Alpine one is different to the Island Set. If you can tell me a bit about what you like to do with the set I can make a suggestion regarding what makes sense to use as a development starting point for you game setting.
You can also download the demo builds that are linked in the posts to walk around and see what they offer and how things look.