itch.io

I had the same concern, but if you download the itch.io app, and then install poke-re, you can go to the install folder and make a copy of the poke-re folder, and move it to a safe place on your computer, and now you have a functional offline version of the game without having to use the app. I know it's a lot, but for the sake of preservation I wanted to see if it was possible, and it seems to be, so you might want to give what I did a try yourself. Unless you're on mobile, then I can't help you.

Thanks Moonshine for the suggested method! I'm not sure why the download function on the webpage is missing, but download via itch app is the current available solution for now.