You probably have an old version of BioExplorer. Inner Tube & Particle Editor require BioExplorer 1.3 or above.
To check what version of BioExplorer you have:
- Open BioExplorer and go to "Help -> About BioExplorer...".
- You can download the latest version of BioExplorer from http://www.cyberevolution.com/. Inner Tube & Particle Editor require the full (not trial) version of BioExplorer