NSIS (Nullsoft Scriptable Install System) is a professional open
source system to create Windows installers. It is designed to be as
small and flexible as possible and is therefore very suitable for
internet distribution.
Being a user's first experience with your product, a stable and
reliable installer is an important component of succesful software.
With NSIS you can create such installers that are capable of doing
everything that is needed to setup your software.
NSIS is script-based and allows you to create the logic to handle
even the most complex installation tasks. Many plug-ins and scripts
are already available: you can create web installers, communicate
with Windows and other software components, install or update
shared components and more.

Change Log:
Major Changes
* Library uninstall-reinstall-reboot problems workaround (bug
#1097642)
* Minimized number of cases where an error message appears in
silent mode
* New compiler predefines for code scope (patch #1644712)
Minor Changes
* Added /P command line option for setting process priority of
makensis
(patch #1638974)
* Added support for 64-bit PE on POSIX to GetDLLVersionLocal
(patch
#1643633)
* Append last part of InstallDir only to $INSTDIR on directory
pages (bug
#1174184)
* Avoid permissions change of output files for LineFind and
FileJoin (bug
#1631773)
* Fixed erroneous warnings on uninstall sections (bug
#1631889)
* Fixed lossy Unicode conversion in resource editor (bug
#1083492)
* Ignore invalid preprocessor commands in ignored block or
comments
* Made VIAddVersionKey only query language tables instead of
creating them
and generating warnings (bug #1626504)
* Minor documentation updates and fixes (including bug #1642107,
patch
#1649187)
* Warn when continuing a comment line using backslash (bug
#155417
New/Changed Commands
* RegDLL and UnregDLL now use LOAD_WITH_ALTERED_SEARCH_PATH, so
there's no
need to use SetOutPath to set the working directory (bug
#1638191)
Utilities and Plug-ins
* InstallOptions 2.45: Added FOCUS flag (patch #1634704) and fixed
paste
with ONLY_NUMBERS flag (bug #1652075)
* MakeNSISW: settings in HKCU instead of HKLM (bug #1411970) and
MRU menu
accelerators
Translations
* Added Galician translation (patch #1631765)
Build System
* Added a workaround for building on x64 POSIX platforms (bug
#1646170)
* Added a workaround for strict-aliasing compatibility (bug
#1635841)
* Added compression tests
* Added STRIP, APPEND_CCFLAGS and APPEND_LINKFLAGS build
options
* Fixed SCons 0.96.94 compatibility
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