AutoRestore|Quarantine Troubleshooting Steps and Solutions
http://forum.ait-pro.com/forums/topic/autorestore-quarantine-guide-read-me-first/#ARQ-Troubleshooting
There are several different solutions in the link above to restore excessive files from Quarantine. How did you do the Theme update? From within your WordPress Dashboard? Using a 3rd party remote installation plugin? Uploading theme files via FTP?