The log however shows the files were repaired successfully, and a manual unpack after the fact works fine.
Version: 0.5.62010-11-26 14:49:06,161::INFO::[newsunpack:846] Verified in 4 seconds, repair is required
2010-11-26 14:49:08,269::INFO::[newsunpack:959] Repaired in 2 seconds
2010-11-26 14:49:08,269::INFO::[newsunpack:684] Par verify finished ok on .vol000+01.par2!
OS: WinXP SP3, patched to date
Install-type: Windows Installer
Firewall Software: WinXP SP2 Firewall
Are you using IPV6? no
Is the issue reproducible? yes