Windows .jar Unable to load modpack.

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Try adding the information below to the java additional paramters box in advanced options in the launcher. Just copy and paste the text into the box.

-Djava.net.preferIPv4Stack=true

Also make sure that your av/firewall is not blocking java or the launcher.
 
Thank you for all of your suggestions. I have tried the -Djava.net.preferIPv4Stack=true but it didn't work. I have no antivirus running and I have tried with windows firewall disabled. Still no luck.
 
I am having same problem. Click launch it flashed then nothing happens.

NVM got mine working. checked console and it said my password was wrong. Fixed it and working good now.
 
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