Hey,
thank you for getting in touch with me.
With the Humble-Bundle Asset-Pack, you've got the "2D Isometric Starter Style Plus Kit".
This means the following styles are included:
Comic-extreme, Paper, Semi-realistic, shadows, and semi-realistic-ghost.
All other styles are not included.
If you wish to have the other ones too, you've to buy the other pack "2D Isometric Starter, Standard Kit"
Currently, there're no updates since the purchase. But there will be updates in the future. I'll write GameDevMarket to clarify why the links are dead.
This could take a few days until everything will work again.