Make Adobe Stock Images and Vectors avialable to earlier versions of the app.
Remember there are a lot of people that use Creative Cloud but are limited by the equipment they are using. The latest version of Illustrator I can use on my computer is 2019 and when I try to save or open a vector from Adobe stock I am informed that I need the latest version to continue. This is not possible. If you wish to offer free images/vectors make sure they are free and accessible to other versions other than the latest. Please do not increase user frustration by misleading what is available.
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When an older app get a new functionality, it becomes a newer app.
Unfortunately no reverse adding features is possible and I doubt ever be. 'This is not possible', just like you said, even more than this, because you can upgrade your machine to run a newer version.
The only way to access new features is to install a new version that has it. If your computer can’t run it — I am afraid you won’t be able to.