It's annoying that the "un-registered" version[0] (the one where you don't have to fill out a form) only runs on Windows. I wonder why. I'm not really sure what kind of danger Dyalog is trying to protect themselves from.
I'm not sure how big the market is for them or related array language. Seeing J became essentially open source, and kdb+ released their 2nd grade 32bit for non-commercial use too, I guess the industry is shifting toward more consulting/training services.