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Download the binary package (currently, this is the nightly build from https://builds.apache.org/job/flex-sdk_release/lastSuccessfulBuild/artifact/out/ but any release after 4.12) from http://flex.apache.org/download-binaries.html will work) and unpack it.
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tar zxvf apache-flex-sdk-4.12.0-bin.tar.gz |
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