First, DirectX 10 must be installed.
Second, your PC must have a graphic card that supports DirectX 10.
Without a compatible hardware, the game would not be able to use DirectX 10.
DirectX is available in different versions, and DirectX 10 is one of them that came with extensive changes.
All the changes were made to improve DirectX 10s capability.
In addition, DirectPlay dplay.dll was deprecated in favor of dplayx.dll.
These information are not that useful for end users.
They couldnt care less about all the changes that took place.
What end users really want is to play games without any trouble.
The installation is far from being complicated.
Its all because DirectX 10 installation is made as easy as possible.
The customer base grows larger because of it, giving more profits to Microsoft.
Just one click and it will be downloaded to your setup.
If you use Google Chrome, you may need to confirm the download first to get the download started.
