That's interesting! A few friends of mine and I tried to get a hold of it during the last school year. But we were greatly annoyed that there was no good free/open source resource in our language. Everything that could be good material was basically "Pay for the course" or just buy the book for 50€. That demotivated us quite a bit. I get why you would like to make a buck for your work and yes learning languages in groups is more fun but besides badly formatted vocab sheets there was no resource that was a proper introduction to the language.