In Windows 10 you have ClipStudio Paint installed in folder:
C:\Program Files\CELSYS\CLIP STUDIO 1.5
under that there are these folders
clip studio coordinate
clip studio modeler
clip studio paint
In the file "Distribution.zip" you should found the same structure (not all subfolders are present).
So, you must simply copy the contents of Distribution.zip into the "C:\Program Files\CELSYS\CLIP STUDIO 1.5" folder, overwriting current files with the translated ones.