I downloaded the Canon LIDE scanner software. The file was a StuffIt (.sit) file.
After I decompressed that, I was faced with “CSToolbox_OSX_v4130X.app.” That installed … another installer. The “CanoScan Toolbox Installer” actually installs the software.
Ideally, this would have been a drag install from a mounted disk image. They could have at least used the Apple installer.