From NSIS Wiki
Is there an I18N version can be downloaded?
- Every version of NSIS supports I18N of installers. Take a look at the examples, like languages.nsi or Modern UI\MultiLanguages.nsi. The tools used to create installers (makensis.exe, makensisw.exe, the documentation, etc.) do not support I18N. However, there are translations available for certain parts. There is a complete French translation, documentation German translation and probably more I forgot. --kichik 09:52, 15 October 2006 (PDT)
This page should include the information that the zip files are intended to be extracted into the main installation directory on top of a standard installation of the matching NSIS version. Of, course, it is rather self-evident if you have worked with NSIS before but it can confuse new users. Froesccn 08:48, 4 February 2010 (UTC)