If this design has repeated-measures (e.g. each subject has more than one con_ image per subject) in the full-factorial; then the group model should be re-run as a flexible factorial to look at the within-subject effects. The main effect of group or any effect of group isn't valid when you have repeated-measures in the GLM.
Also, it maybe just as quick/easy for you to setup the analysis yourself as it's only one model that you need to create. This would also help you learn the software and the analysis, rather than picking up in the middle of an old analysis stream.