Byteman 4.0.4 is now available from the Byteman downloads page and from the Maven Central repository. It is the latest release for use on JDK9+ runtimes. It is also recommended as the preferred release for use on JDK8- runtimes.
Byteman 4.0.3 updates the 4.0.3 release to ensure that it works correctly on the latest jdk11 releases. Specifically, it ensures that Byteman is able to process class files with a JDK11 class file version (the previous release would run on jdk11 but could only classes whose bytecode file version was for jdk10 or lower. More details can be found in the Release Notes.