Just visited http://www.prezi.com and it was a bit tricky to obtain a free “Edu Enjoy” plan.
Here’s step-by-step process for your info:
1) Copy & past this address to your browser https://prezi.com/pricing/
2) Bottom-left corner, you’ll see in green “Plans for education”. Click it.
3) Three plans will show in columns. Select the “Edu Enjoy” free plan in gray color.
4) Although it says “Student/Teacher Verification”, enter your work email and click “Verify”.
5) Although it says “School or University details”, enter your court information and click “continue”.
6) Educational license registration message will appear for confirmation email instruction.
7) Follow the instruction on your email.
8) After about 24hours, I received another email indicating they have granted my “free” plan.
Hope it works for you!