An installation executable (*.exe) that contains all of the necessary pre-requisites, required and optional components can easily exceed 1GB in size.  Issues such as:

• all users must have an internet connection to download and install software,
• having multiple users download enormous executables,  
• downloading executables that contain unwanted options or components,
• and, ensuring enough free space on all users computers

are commonplace as software installations become more complex.  In response to this, software and game developers are now delivering a small executable that downloads the installation files. This includes companies such as Microsoft, Bentley, Google (Chrome), Mozilla (Firefox) and more.  Once downloaded, the administrator can create a deployment image to distribute the needed components to install the software on each users machine.    Some advantages of using a deployment image include:

• Internet connection is not required for an installation from a deployment image.
• Separate pre-requisite pack or set of packages before installing product are not required.
• The installation location can be decided and set in deployment image. Once defined, the product will be installed at the same location on all the machines.
• The components to be installed are preselected at the time of creating deployment image. This results in all machines having exactly same set of installations.

For information on creating a deployment image for OpenCities Map CONNECT Edition, please refer to: Creating a deployment image

Related:

MicroStation CONNECT - How to create a deployment image