Casio provides free emulator until 8/31/2021

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https://edu.casio.com/softwarelicense/aid/manager/en/
casio provides free casio's calculator emulator until 8/31/2021, It supposed to 90-day trial, but trial term extended double. But There aren't much information about that.

If you want to download free emulator, follow these steps.
First, download "Software download" and "Cost-free period extension patch download" which in above link.
   
Second, extract file from two .zip file and run .exe file.

Third, open folder named [calculator name]_aid_w. and click batch file.

Suppose you follow these steps, your emulator expiration term become over 170 days.
   
There are emulator screenshots.



which is fx-570ES PLUS 2nd edition.



which is fx-570EX, same as fx-991EX.



which is fx-9860GIII.

Enjoy your Calc emulator!