Since DoubleType is a Java program, if you don't have Java runtime environment 1.4.2 or above, you need to download it and install it first.
It is recommended to have "Support for Additional Languages" installed.
Here is the instruction to add Support for Additional Languages to your Java runtime environment on Windows.
Then you should download the latest version of DoubleType zip file. After picking a mirror server, the download will start.
Extract the zip file. For example if you extracted DoubleType-0.0.5.0.zip the following folders will be created.
DoubleType-0.0.5.0 + doubletype + src + bin + doubletype.jar
doubletype.jar is the executable file of DoubleType.
There are two ways to run DoubleType. The first way is to run it from the commandline. Go to the "bin" folder and run the following command.
java -jar doubletype.jar
Once you know it runs on your machine, you can try the second way. Simply double-click on doubletype.jar file.