That's a bit complicated. Ariel Redux was originally published as standalone swf files. It's still possible to play those if you find a copy of the old standalone Adobe Flash player (buggy, unsupported and vulnerable to malicious exploits). Or you might try Ruffle, a free software project that aims to emulate it in a more-or-less safe way.
https://ruffle.rs/
However, SWF embedded in a PDF is a different problem. I'm pretty sure that the player was also integrated into older versions of Adobe Acrobat Player, and current versions are likely to simply ignore the embedded media.
It just might be that there is some other PDF player that will work with an external Flash emulator such as Ruffle. Maybe installing the Ruffle plugin will make it work if you use the integrated PDF reader in a browser, for instance. I didn't test it, I have no idea if it will work.