I have a friend trying to get onto our server. We are using a custom, Direwolf20 modpack that works for three of us but not him. He's a PC user, same computer as my own. He loaded up the launcher, logged in, hit download on the modpack, it got to about 80% then said there was an error. We redownloaded the launcher and tried again. This time is downloaded, he was able to enter into the game. He left to edit the modpack and take off mods and add mods and when he hits launch it says "error occured while downloading the game." If it worked before, and works for everybody else (2 PCS and 1 Mac), why can't it work for my friend who has the same computer as me?