Platea : Epic Bundle is a collection of 3 products - Platea, Platea : LR and Platea : Fallen.
In this set you get the original base set, which features the highly detailed, versatile courtyard exterior. In addition to this, you get the low-resolution addon pack, to provide greater flexibility for use (or for those with more modest systems) and to top it all off you also get the texture expansion to transform both packs into a decaying, abandoned setting.
This collection brings everything together at a price which is a cheaper than the cost of the individual parts.
For details regarding each product, please refer to the respective product pages.