Proxy only client not connecting?

I've done this: https://www.mpgh.net/forum/showthread.php?t=1203392 for every update but whenever I try to do it with this one I just get a permanent loading screen. How do I fix?

Try adding the swf file to your Adobe Flash Player trusted locations.

The swf is on trusted and I've tried different flash version with no success. Has anyone been able to make one successfully?