There's runs like this one where it says "Adobe Flash Player is no longer supported". What was on there and how do I view them now?

I honestly can't tell you why that Twitch Highlight needs flash, I haven't seen that before. Maybe something weird about how the link was posted years ago, not sure.

But here's the run anyway:

Thanks, that is weird.

I was wondering how you would get around this and view runs that say they need Flash Player in general.

For viewing runs on the site that say they need flash, they probably don’t actually need flash. I would imagine that most video hosting sites auto-converted any flash videos into a more supported format years ago, so if a run says it needs flash for some reason, you can probably go and find a non-flash version on the site it’s hosted on like I did above.

If a run legit needs flash and it’s not available in another format, then, well idk. You might need to find some kind of extension that emulates flash. I’m not an expert on flash, I never installed or used it, and actively blocked it, on any computer I had for security reasons. Someone might be more knowledgeable on it and have more detailed recommendations for you.