The apks/aab or android installers are tied up to Google Play mostly (or other trusted app stores you have). So archives of versions old or new are there. Its relatively easy to install them given you have access and know the version you are looking for. So the troubling part is the access, since usually only the makers or publishers of these apps are the one’s who have access.
The only thing Google Play displays is the latest version of the app, if you are a user, you won’t be able to see the older versions.
You might get other sources of the said app version publicly but its hard to know whether its tampered or not.
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