Can't open any downloaded packs

[meganerd19]

Launcher Version: 253

Operating System: Windows 8

Java Version: Latest

Antivirus Program:

Description of Problem:

"Error unzipping file for the following pack: <insert pack name>

Error unzipping file: <insert directory>

Please consult the modpack author or try to run the pack again."

I am getting this error message for every single modpack download. Every. Single. One. If it comes from the 'Browse Modpacks' section of this site then it results in this message without fail.

Error Messages:

See above.

Error Log:

[meganerd19]

Well? Anyone?

[john wolf deveau]

PLEASE HALP MEH!

PLZ

[OuterMars]

I have the same problem same system and everything.