1. Download Flex SDK ZIP file from the Adobe website.
2. Create a directory to contain Flex SDK.
3. Extract the Flex SDK ZIP file to this directory. The Flex SDK contains the following directories:
* /ant — Contains Flex Ant Tasks.
* /asdoc — Contains helper files for the ASDoc tool that creates HTML documentation from your MXML and ActionScript source code.
* /bin — Contains the mxmlc, compc, asdoc, and fdb utilities. The bin directory also contains the jvm.config file, which specifies Java settings that you can modify, if necessary.
* /frameworks — Contains compiled framework classes, configuration files, and framework source code.
* /lib — Contains JAR files used by the utilities.
* /runtimes — Contains installers for the Adobe AIR runtime inside the air directory and installers for debug versions of Flash Player 9 inside the player directory.
* /samples — Contains sample applications.
* /templates — Contains HTML templates for Flash Player detection and browser integration and inside the air folder, a sample Adobe AIR application.xml file.
4. Ensure that the Java Runtime Environment (JRE) is installed on the computer and that the java_home/bin directory is defined in the system path. JRE 1.4, 1.5, or 1.6 is required. For 1.4, JRE 1.4.2_06 or later is required.
5. Install the appropriate debug Flash Player from the install_root/runtimes/player/platform directory.
6. (Optional) When the Flash Player installation finishes, restart your computer to ensure that the updated Flash Player browser plug-in is enabled.
7. Continue by reviewing the explorer sample. To run the explorer sample, you must first compile it running the install_root/samples/explorer/build.bat (Windows) or install_root/samples/explorer/build.sh (UNIX and Mac OS X) files. For more information on the Flex compilers, see the "Using the Flex Compilers" chapter in the Building and Deploying Flex Applications manual.