RamblingRoss
The blog of Ross Fruen, a .NET consultant Installing Canon 4200F drivers under Windows 11
Drivers
From the Canon CanoScan 4200F support page download the drivers for 64-bit Windows 7.
Extract the contents of this executable to a folder which will result in two files being available, readme.txt and setupsg.exe.
Extract the contents of setupsg.exe to a folder. From the extracted files right click on cnq4200.inf and from the context menu select Install. After this is complete the TWAIN drivers for the scanner should be available within Windows 11.
Toolbox software
The CanoScan Toolbox appears to still be operational within Windows 11.