Even in Test Mode, some installations require the MultiKey.sys file to be manually signed using a tool like (Driver Signature Enforcement Overrider). Copy MultiKey.sys to C:\Windows\System32\drivers .

Understanding MultiKey.sys on Windows 11: A Comprehensive Guide

Here is a breakdown of what these tools are, how they work, and what you need to know before using them.

Installing or running MultiKey.sys on Windows 11 often triggers the following problems:

Choose and point to the directory containing the MultiKey.sys and .inf files.