I want to download after effects 2022

Just do what the others say but don't delete 2021. You should keep it until you're sure that you'll stay on 2022 because sometimes the new versions are buggy. I wanted to switch from 2020 to 2022 but when I tried using it, it just crashed every 30secs after 3 hours of editing. (probably because it wasn't compatible with uni.vhs but i'm not sure)