PebberJack

usually the modpacks i want to play, have trouble with the DL links. Now i know thats something the modpack creator has to fix. this time he kinda did, well he posted a ned DL link and said if the old one didn't work we should use the new one. i couldn't get it to work through the launcher so i figgured i could change something in a file somewhere, where it said where the launcher needed to DL the modpack from. so my question is: how does the launcher know where to DL the modpack from? and is there a way for me to change that, since i now have a working link to the modpack.?