I first did a trial run for the modules and modules menus migration. These went fine, but after it was finished I found out that alle my articles and menu's were gone, argh...!
So it appears I will have to rerun this and then do articles, menu's, modules and modules menu's all in one batch... I went back up the backup of just after the users migration and setup jUpgrade Pro as follows:
And that ran fine. Pfew !