Following the guidelines on Jagex's website, I deleted the rs caches. That allowed the client to boot up to 18%. And it stopped there.
I uninstalled Java and reinstalled Java. That didn't help, except I have 1 Java installed, instead of the 3 I had before.
The last time I had problems with rs client, I had to delete and reinstall it. So, did that, only I cannot download the rs client. It's corrupted, or something.
So, I decided to try downloading the gamebar.
Still won't load the game.
Hmmmm.
Looks like I won't be playing rs until Jagex fixes whatever they broke.