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What version is used can be detected in the ant properties file that is used to build izpack. It is [izpackroot]/src/ant.properties. The value of the property "source" determines the vm version.
If compatibility to older versions is needed, a recompilation of the jar files of the izpack system should be done. For this the sources of izpack and an ant installation are needed. the sources of izpack are selectable at installation time of izpack. Before a recompilation of all can be triggered, the version of byte code should be changed. This can be done simple by changing the "source" entry in [izpackroot]/src/ant.properties to the needed value. The recompilation should be performed with the current most used vm version because there are classes of it referenced in the izpack code. Usage of an older vm version at installation time will be possible because the classes of the newer vm version are only used after a vm version check. Of course, some features of izpack will be missing at using an old vm version. To recompile izpack go into [izpackroot]/src. Use a current jdk (not jre) for this. call
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ant all |
then all jar files in [izpackroot]/lib, [izpackroot]/bin/panels and [izpackroot]/bin/customactions should be recompiled with the selected source version.