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With Supercopier, use Ctrl + click/drag to copy files.
SuperCopier Website
In Supercopier's Confuguration settings, go to "Copies & moves behaviour", and in "Old file renaming pattern" type "" and in "New file renaming pattern" type "Copy of ".
If you use just right-click and drag to make file copies, the context menu will give you the option to use Supercopier, but the default option is Windows' own copying.
However, if you use Ctrl + click/drag, it uses Supercopier to copy, and the copy is named according to your preference. If a file is copied using Ctrl + click/drag to another directory, the renaming pattern is not used -- the customised renaming is used only on files copied to the same directory.