Download of EOTN 4.06 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The following version: 4.0 is the most frequently downloaded one by the program users. The program is included in Education Tools. This PC software is suitable for 32-bit versions of Windows XP/Vista/7/8/10/11. We recommend checking the downloaded files with any free antivirus. This free software was originally created by John Huguenard & David A. McCormick.
From the developer:
EOTN (Electrophysiology of the Neuron) is an interactive tutorial which allows you to discover for yourself the mechanisms of generation of electrical activity in different preparations through the performance of experiments on your computer.
You may want to check out more software, such as ExamForce Engine Installation CM, Musical Scales or Touch-Typing, which might be similar to EOTN.