The Light version of the download (.NET not included) is intended for users who already have ODEX Enterprise installed.
This does not include the Microsoft prerequisites SQL Server '05 and the .NET framework (these would have been installed as part of the original installation). This means that you only have to download and install this smaller download.
If you are upgrading from ODEX Windows or ODEX Professional, or installing a fresh system, you will need the full version.
ODEX Enterprise v2.3.0.1087 Full Version - Includes .NET Framework and SQL Server '05
ODEX Enterprise v2.3.0.1087 Light version - Requires .NET Framework and SQL Server '05