I am trying to set up a technic pack of my modpack, which I have previously only used in a modded vanilla launcher. I figured it would be easier to run it through Technic, but am unable to even get the download to happen. When I add my modpack's URL and click play, it shows that it begins to download it, but then gives me this error saying it failed. I have tried 2 different download locations, the current one being my dropbox. Nothing seems different, regardless. It looks like it finds the file, but can't download it. When the error occurs, the progress on the right stops at (NEGATIVE) "-4568800%.modpackname-1.0.zip." The number seems random every time. I have been away from Technic for a couple years now, so what might be going wrong?
http://www.technicpack.net/api/modpack/magimek
EDIT: I have tried filehosting.org, dropbox, and copy.com. They all have direct links that work perfectly when pasted into any browser. The launcher still cannot download it.