How can I get Ruffle Emulator to work?

[FreeCowboy]

For maybe the 5 people that remember me, I want to play PR2 again and want to know how. I go to the page for pr2 and press "run anyway" for the ruffle emulator, and it stalls at a black screen. Help?
If there's an FAQ for this question somewhere on the forum, I apologize for this pointless thread.