Note: Apple removed many legacy drivers in macOS 11 (Big Sur). The 2021 Canon package restores support.
Searching for a driver specifically from "2021" indicates you are likely looking for a version of the driver that was stable on older Windows 10 builds or specific macOS versions.
However, downloading a driver from 2021 is not always the best move in 2024. Driver software is updated to patch security vulnerabilities and improve compatibility with Windows 11 or the latest macOS updates. While the 2021 version might be what you are used to, the latest version from the Canon support site is almost always safer and more functional.