Blender 4 documentation:

The Chateau de Noisy model comes with 3 files:

1. Chateau_Buildings_B4.blend
2. Chateau_Environment_B4.blend
3. Chateau_Example_B4.blend

Chateau_Buildings_B4.blend contains the castle model including the side buildings. The model makes extensive use of collections. The main collection is called "ChateauNoisy". Append or link this collection to your file.

As a bonus, Chateau_Environment_B4.blend is provided, which contains the outside of the castle including trees, grass, garden, paths. Main collection is "ChateauNoisyEnvironment". Append or link this collection as well to your file if you want to have the complete environment. If you only want to include visible geometry into your scene, append or link one of the following collections, which are subordinate to the "ChateauNoisyEnvironment" collection:

1. 01_Trees (trees on front, side, rear)
2. 02_OutsideRear (the garden)
3. 03_OutsideFront (the street)
4. 04_Ivy (ivy growing on castle walls)

Chateau_Example_B4.blend is an example of how to use the models in one scene. It includes 4 cameras, which were used to render to demo images.

Blender 2.x / 3.x related documentation:

The Chateau de Noisy model comes with 3 files:

1. Chateau_Buildings.blend
2. Chateau_Environment.blend
3. Chateau_Example.blend

Chateau_Buildings.blend includes the castle model including the side buildings. The model makes extensive use of collections. The following four collections bring everything together:

1. 01_Towers (all the towers of the castle)
2. 02_Houses (everything between the towers)
3. 03_SideBuildings (buildings on the right side)
4. 04_Terrace (terrace on the rear of the castle)

Append or link these 4 collections into your scene. The numbering makes sure that they appear ahead of all the other collections. Depending on your view, you may skip, for instance, the terrace collection if you are looking at the front. 

The chateau contains about 310,000 Faces. It instances parts heavily, e.g. like towers. The file size is about 700MB.

As a bonus, Chateau_Environment.blend is provided, which contains the outside of the caste including trees, grass, garden, paths. This file uses the following collections, which can be appended or linked to your scene depending on their visibility:

1. 01_Trees (trees on front, side, rear)
2. 02_OutsideRear (the garden)
3. 03_OutsideFront (the street)
4. 04_Ivy (ivy growing on castle walls)

File size is about 4.3 GB. The outside contains about 29.5 million faces such that it is highly recommended to only link or append the really needed collections. 

Textures are from textures.com, textureheaven.com and cc0-textures.com.

Chateau_Example.blend is a simple example to link everything into one file. It is less than one MB large, but during rendering Blender reports about 60GB memory use.