# NSIS Portable Help

## Nullsoft Scriptable Install System

NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers and other applications. It's packaged with a PortableApps.com launcher as a portable app, so you can use it from a cloud folder, portable drive, or local folder without needing to install it on each PC. Learn more about NSIS...

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Go to the NSIS Portable Homepage >>

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This software is OSI Certified Open Source Software. OSI Certified is a certification mark of the Open Source Initiative.

## Portable App Issues

- Downloading a Portable App
- Installing a Portable App
- Using a Portable App
- Upgrading a Portable App