NSIS adds only about 34KB of code of its own (for the default configuration) to the data. NSIS compiles all of the files and the installation script into one executable file so your application will be easy to distribute.
NSIS is very flexible and its scripting language is easy to learn. NSIS allows you to create everything from basic installers that just copies files to very complex installers that handle a lot of advanced tasks such as writing registry keys, settings environment variables, downloading the latest files from the internet, customizing configuration files and more. NSIS is a tool for developers to create such installers. The user doesn't have to worry about things he might have forgotten because all of the necessary steps were done by the installer. After the installer has finished the user is left only with the simple task of starting the program. The user goes through a wizard, makes the appropriate choices and waits until the installer finishes. All the user needs to do is supply some information and the installer will do the rest.
All of this is done automatically for the user. The installer copies and/or updates files, writes registry keys, writes configuration, creates shortcuts, etc. Most software packages you download or buy come with an installer. Chapter 2: Tutorial: The Basics 2.1 Introduction
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