Even tho the log file says it stopped the download after 60 seconds of slow connection. This is not true. My connection is stable and fast and the error occurs after no slow down / stop of the download. It seems the launcher thinks, that the download is stuck even tho this is not the case.
I have the same issue.
Heres my log.
https://bugs.mojang.com/secure/attachment/298713/launcher_log-1.txt
@Cyril this should only happen if the connection issue is 60seconds long accordingg to the log file. It seems that the timer of the launcher is miscounting 60seconds.
@Duncan I will try this later