As written here (English version) there is a "minimalist download iso" on this site that can be used to run the emulator.
However many members on that site (at least 3, including me) can't find that iso on this site. What happened to that? And, when I run the emulator I get "An internal error occurred. 0x00000001". Is that normal when you don't have a disk?
Note: I am interested more in hacking the calculator than calculate, since I can make an emulator of fx-570ES (not plus) from fx-82ES, and also have emulators of the fx-570VN PLUS one.