I have java version 1.8.0_65 installed in my mac laptop, whenever I try to run topcoder ContestAppletProd.jnlp file, it shows "Application blocked by Java Security, reason: Your security settings have blocked an application signed in with an expired or not yet valid certificate from running". I know these problem have been posted tons of time, and some people suggest unintstaling java 8 and then installing some older version, but so far I could not even uninstall java 8. Can anyone please help? :(