Close MS4 first.
Direction to MS3 computones folder: (in your case will be debut folder)
C:\Program Files\e frontier\Manga Studio3 EX\Settings\Tone\Computones
Then highlight and copy the folders you want to import to MS4. For example, the Pattern folder.
Then go to MS4 tone folder:
C:\Program Files\Smith Micro\MangaStudio EX 4E\Settings\Tone\Computones
Paste the folder here.
Now you should find the pattern folder inside the computones.