FG60E best fw version for basic features & stability

I have just acquired a fg60e, i realise it's end of life but i plan on using it just for learning firewalls, vlans etc so don't need full licence for extras, i plan on doing cisco & fortinet free courses to understand more about networking & security.

Tonight i have got it setup & connected to the internet & noticed it's running fw v 6.0.3, i realise it's old but in your opinions would this be adequate for learning the basics of fortinet OS or can you suggest a more up to date stable fw version.