They do have Ruffle on their site (a bit slower to load IME, but functional) even for new animations (click on the HR icon, not the Youtube icon).
There are the orginal .SWFs for that, disjointed in their own way. I wish they (or someone) would've merged things so the old menus actually worked, if not further like each file being a season.
EDIT: they did make the games linked together on the website. And now I do see one of the main pages that links too, though the loading screens make it a bit cumbersome (it seems to be tweaked for Ruffle, or at least only the main page seems to work when the .SWF url is loaded in the standalone player ...unless it just can't do linked swfs).