A friend of mine want to learn ActionScript and saving money to buy an Adobe Flash software license. As a developer I suggested to use Adobe Flex instead.
The Adobe Flex SDK is an open source toolkit for building rich applications for browser, desktop and/or mobile devices.
Installing Adobe Flex SDK
First download the latest Flex SDK here.
After the download is complete, extract it to your home directory.
Installing Adobe Air SDK
If you want to install Adobe Air SDK download the latest version from Adobe Air SDK website.
Extract it and replace/merge the files from the AdobeAIRSDK folder to your Adobe Flex SDK directory.
Note: If your using Unix-base OS, some don’t merge the files on folder instead it over write the folder. In this case you have to manually copy the files.