If you are switching to a new computer or you’ve already activated your onOne product on 2 computers you can deactivate a copy to free up a license.  All you need to do is start up your product, and from either the Help menu or Photoshop menu select deactivate.  Do not choose to remove.  Removing will make your license code completely inactive.  Once you’ve deactivated on one computer you can then activate it on another.