To manually remove C-Pen Core on OSX, follow the below instruction (do note that these instructions are not specifically made for Yosemite and deviations may occur):

Erase the following files:

  • /Library/Frameworks/CPen20.framework
  • /Library/Input Methods/ or later
  • /Library/PreferencePanes/C-Pen 20.prefPane or later CPenCore.prefPane

Only applicable to older verisons

  • /Library/Components/C-Pen 20 Input Method.component or later [none]
  • /Library/LaunchAgents/com.cpen.CPen20Startup.plist or later [none]

Some of these files may be in use and will therefore not be erased. But drag them to the Recycle bin and restart the computer before emptying the Recycle Bin.(You need to have administrative privileges to be allowed to erase most of these files).