The error message "A driver supporting Solution Menu EX is not installed" typically appears when the software launches but cannot communicate with the hardware because the underlying or Scanner Drivers are missing, outdated, or corrupted.

Solution Menu EX is the interface (the menu), while the MP Drivers are the engine that makes the hardware work.

Most official Canon Support sites note that Solution Menu EX has been replaced by Quick Menu for newer operating systems like Windows 10 and 11. Official Download & Installation Guide

To resolve driver issues, you must download the specific driver package for your device model rather than just the menu software.