This sometimes may happen using the FC Addons Tool…
Just close FreeCAD and manually delete the folders:
C:\Users\jules\AppData\Roaming\FreeCAD\\Mod\kicadStepUpMod
and
C:\Users\jules\AppData\Roaming\FreeCAD\Mod\kicadStepUpMod.bak
Then open FC ad install StepUp WB as usual
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