quanta - 2014-10-16

It sounds like the duplicate of bug #1237 (7-Zip 9.22 can't extract some NSIS archives) or #617 (extract nsis package bug). However, #617 involves a case of files with same name in different folder of the NSIS package, and bug #1237 was listed as open-wont-fix over changed bzip2 method. The only clue over the change is in the release note of NSIS 2.0 Release Candidate 3[1], where some bugs with LZMA/bzip2 and non-solid compression were fixed.

[1] http://sourceforge.net/project/shownotes.php?release_id=215480