the version you have should have the most support, since it's the newest one. But the thing is, support for cobra has been really low these days. Even the official site has been down for weeks.
You can try asking over at maxconsole. They have better support there.
About the boot disc, i'm not really sure since the one i'm using isn't AAA game, but that's also a possibility.
I went ahead and made an account to create a thread there. May I ask which game you're using?