You lose out on firmware patches that improve latency and fix bugs found in the original ISY hardware. Why You Don't Actually Need a "Crack"
Downloading a "cracked" driver for an ISY keyboard (or any keyboard) is highly discouraged due to significant security risks and the fact that keyboards typically do not require such software to function. 1. Why You Don't Need a "Cracked" Driver Plug-and-Play Compatibility isy keyboard driver cracked
The cracked ISY keyboard driver has raised several red flags: Alternatives to Cracking a Keyboard Driver
Right-click your ISY keyboard (it might show as "HID Keyboard Device") and select . isy keyboard driver cracked
If the keyboard has physical damage, no software driver will fix the hardware issue.