With Nokia Application Installer you can save your computer from being overlaoded with installation files.
To start, click Tools > Nokia Application Installer.
When the Nokia Application Installer window appears, browse for the desired application file stored on your computer. Select the application that you want to install onto your device and click the arrow button between the file browser fields to start installing.
You may need to complete the installation on your mobile device as well. Just follow the instructions on the screen of your device.