I'm sorry to hear that you were having trouble using our Modpack in the Technic Launcher. I've listed two guides below that will explain some troubleshooting solutions that may help you:
Use this guide if you are having trouble downloading the Launcher/Modpack: http://troubleshoot.mc-complex.com/
Use this guide to learn how to allocate more RAM: http://ram.mc-complex.com/
If these two guides do not address your specific problem, please feel free to let us know your issue on our forums or by creating a ticket in the #help-and-support channel of our Discord and a member of our Staff will help you out right away!