Casio Fx991es Plus Games Code Repack [patched] Site

You do not "install" software on the fx-991ES PLUS. You type it. Here is the general workflow using the repack's instructions:

The term "repack" usually implies a modified firmware. There are modified versions of Casio calculators (often called "Unbricked" or "Hacked") found in grey markets. casio fx991es plus games code repack