Thanks! Problem for the loadable families was that he didn’t find the elements.
For the system families I already tried with all elements. See topic I made, hopefully you see the solution? My goal is to change all my system/loadable families of an existing project with excel. Such as a configurator in Excel and push the changes to Revit.
https://forum.dynamobim.com/t/change-multiple-types-with-excel/76324
@GavinCrump