You cannot use 2.6 either because report-server (1.3.0) used to put in it's own Birt client jars. As far as what version to use, look at the jBPM 5.1 installer build.xml..that will tell you. (https://github.com/droolsjbpm/jbpm/blob/master/jbpm-installer/build.xml -
<property name="birt.download.url" value="http://www.eclipse.org/downloads/download.php?file=/birt/downloads/drops/R-R1-2_3_2_2-200906011507/birt-runtime-2_3_2_2.zip&url=http://download.eclipse.org/birt/downloads/drops/R-R1-2_3_2_2-200906011507/birt-runtime-2_3_2_2.zip&mirror_id=1"/>)
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