News:
Fixed a bug that corrupted $TEMP under Windows 9x and NT and caused InitPluginsDir to fail (bug #1412159)
Fixed a possible buffer overflow caused by long values of $0, when using large NSIS_MAX_STRLEN builds (above 4096)
Description:

Nullsoft Installation System is a pretty small, efficient, capable installation system for win32.
Generates self contained, win32 executable installer.
Uninstall support (installer can automagically generate an uninstaller)
Optional installer self-verification (using adler32)
Robust, efficient zlib-based compression
Approximately 32k overhead over compressed data size
Support for external EXE packers to pack the header
Display license agreement, custom configurations, directory/registry, ...

http://nsis.sourceforge.net/download/
...

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