NSIS 2.19 is out (6. August)
Changes:

Minor Changes

* Fixed !system and !packhdr failure with quoted long file names (bug
#1509909)
* Fixed build problems on 64bit platforms (bug #1504772)
* Fixed negative total size for data larger than 2GB in script compilation
summary (bug #1468852)
* Minor documentation updates and fixes
* Replaced IsDotNETInstalled with a simpler and better version

New/Changed Commands

* Made !if compare strings case insensitively, like StrCmp and !ifdef

Plug-ins

* NSISdl: fixed random DNS errors (reported in the forums)
* System: fixed a bug that caused stack corruption and stopped the
installer from deleting System.dll when a function with no arguments was
called (bug #1535005)
* System: fixed wrong return values for functions that return short or char
(bug #1535007)

Translations

* Added Norwegian Nynorsk translation (patch #1503208)
* Fixed typos in the French translation (bug #1531874)

Download
http://nsis.sourceforge.net/Download