Inner tube is in a loop. When I try to run the software it says I have to register, but when I try to register it says that I am already registered. What should I do?

This error means that you have a serial number for a software version that is different than the software version you are running.
 
Perhaps you are trying to run the Wild Divine, or BrainMaster version on a bioexplorer pass code or the other way around. When you go to your start menu make sure you have a folder named "InnerTube BE" (not BM, or WD). Run the version of Inner Tube in the InnerTube BE folder. If you don't have an Inner Tube BE folder in your start menu please reinstall Inner Tube for BioExplorer. If you don't have Inner Tube for BioExplorer you can download it (or whatever version you need) from this knowledgebase www.eegknowledgebase.com