Problem FTB Revelations crashed. Is it a problem with the way I installed it?

[DamnedDonkey]

Failed to download file.
Name: 3.5.0.jar
URL: https://s3.amazonaws.com/Minecraft.Download/versions/3.5.0/3.5.0.jar
Filename on disk: 3.5.0.jar
Path: /Users/damnableandnotkind/Library/Application Support/.ftba/bin/versions/3.5.0/3.5.0.jar
Exists: File

 

[GGServers]

Not much information about this issue. You would need to try uninstalling the modpack and the launcher, then install FTB and the modpack again to double-check.