Adobe supports only the current and the one prior version, so that would mean 2024 and 2023 currently. You won't get download links older than this via the Creative Cloud Desktop app. Also, Adobe has stopped sharing public download links since 2020 so you won't get a genuine installer on the internet as well. The only chance you have, is to contact Adobe support and ask for the installer, they may provide it though the chances are slim.
Having said all this, may I know what are your reasons to use such an old version of the software?