There appears to be a conflict in licensing older versions of the tools with newer ones. Cortona 2D Editor Pro is bundled with Cortona3D RapidAuthor starting from version 6.3. This event can occur on user's machine with a stand alone version of Cortona 2D Editor Pro installed.
Few steps below will help resolving this issue:
- Uninstall Cortona3D RapidAuthor and Cortona 2D Editor Pro (this article provides with detailed instructions on cleaning all Cortona3D products from user's machine)
- Install Cortona3D RapidAuthor (version 6.3 or later)