...
There are several releases of the project. Please check maven repository for details.
Release 1.x - deprecated, migrate to 5.x.
Release 2.x - deprecated, migrate to 5.x.
Release 3.x - deprecated, migrate to 5.x.
Release 4.x - deprecated, abandoned branch on sonatype, migrate to 5.x.
Release 5.x - deprecated, last version operating on the legacy FDKs available in Maven Central (up to Flex 4.6).
Apache Flex Support starting with Flexmojos 6.x
Release 6.x - stable, refactored branch of 5.x able to work with an alternate FDK structure, under development, new features and major changes on core.
Release 7.x - development, branch able to operate exclusively on Flex SDKs deployed using the groupId "org.apache.flex".
...