D2 requires MySql. Minimum version is 4.1.x
To install D2 on the server side, you only need to install those two databases:
DDL scripts are located in the distribution under the scripts/main directory.
Optionally sample projects are provided. You can find them under the scripts/test directory. An utility script (windows only) is also provided to ease the installation. You can find it under bin/. Usage:
C:> install.bat {host name} {user name}
To run D2 you will need a Java 5 JRE installed on your machine. If not you can download it on Java site.
No special action is required to install D2 on the client side. Just unzip the distribution in the folder of your choice. To launch D2, go into the bin/ directory and run:
C:> d2.bat