Here is the log part for the unrar proscess
[19-02-2007 20:07:23] [PAR2&Unrar] portable nero 7.7.5.1 en .rar.par2 needs 1 more blocks, 10 available
[19-02-2007 20:07:23] [PAR2&Unrar] portable nero 7.7.5.1 en .rar.par2 unpaused 1 blocks
[19-02-2007 20:07:23] [T1] Article started 1/1 portable nero 7.7.5.1 en (win) | 12 mb gepost door shyboy yenc "portable nero 7.7.5.1 en .rar.vol00+01.par2"
[19-02-2007 20:07:29] [T1] Article finished 1/1 Portable Nero 7.7.5.1 En .rar.vol00+01.PAR2
[19-02-2007 20:07:29] [Dec] Yenc file Portable Nero 7.7.5.1 En .rar.vol00+01.PAR2 decoded in 81ms
[19-02-2007 20:07:30] [PAR2&Unrar] Repairing portable nero 7.7.5.1 en .rar.par2
[19-02-2007 20:07:30] [PAR2&Unrar] "c:\program files\altbinz\download\portable apps\portable nero 7.7.5.1 en .rar.par2" Par2 repair started
[19-02-2007 20:07:32] [PAR2&Unrar] "c:\program files\altbinz\download\portable apps\portable nero 7.7.5.1 en .rar.par2" Par2 repair successful
[19-02-2007 20:07:33] [PAR2&Unrar] "c:\program files\altbinz\download\portable apps\Portable Nero 7.7.5.1 En .rar" unrar started
[19-02-2007 20:07:33] [PAR2&Unrar] Error[16]error on create file
[19-02-2007 20:07:33] [PAR2&Unrar] "c:\program files\altbinz\download\portable apps\Portable Nero 7.7.5.1 En .rar" unrar failed
It look like the program has some dificulties when there are spaces within the archive name.
I am using the latest build