Did you install many mods and they dont work? This program should help you. It is scanning installed mods and search for files/scripts with same names in *.bundle and texture.cache packages.

It is written in Java. So you need installed Java Runtime Environment. https://java.com/en/download/
  When it founds conflct between scripts (*.ws files), try this tool http://www.nexusmods.com/witcher3/mods/484
  When it founds conflct between XML,textures, models, then just delete one conflicting mod.