The Flex project suggests that you leave it at the as the default.
The Apache Flex project suggests that you download latest released version. Select the version of the SDK you want to download.Download the installer binary for your operating system (Window, Mac.Installing Apache Flex SDK Using the Apache Flex Installer Or you can install it manually which obviously requires a greater comfort with your platform but provides more flexibility with the installation details. You can use the provided Apache Flex SDK Installer, an Adobe AIR application that automates the process (on Windows or OS X/macOS). There are two ways to setup the Apache Flex SDK.
