GO HERE FOR OLD REDDIT UI: https://old.forum.guncadindex.com/
This UI used to be bugged, with a couple rate-limiting issues among other things. Courtesy of some bugfixes, it's back in action again.
It's called mlmym, and if you ever need the link to it, it's in the sidebar.
If you encounter any bugs or issues with it, please report them here. Note that it might not have all the features the other UIs do as a result of basically just being the Old Reddit interface.
Is this just for on the PC? Or is it like an app we can use?
I mean, you can browse it on your phone if you really want to, but it's the https://old.reddit.com/ UI. More suitable for desktop usage.
To be clear: this is just a different way to access the same set of forums.