Inno Setup is a tool for automating Windows software installation, and is based on a script-based compilation model: it reads plain-text .iss configuration files and generates a single self-contained EXE installer (no runtime dependency). File lists, registry operations, shortcut definitions and conditional logic are all resolved at compile time and the result is packaged using deflate, bzip2 or 7-Zip LZMA/LZMA2 compression.
Installers feature a standard Windows wizard user interface, allow silent and automated installation, support both administrative and non-administrative installs, and contain a complete uninstall routine without any additional authoring work. A built-in Pascal scripting engine allows for custom logic to be added at any point in the install or uninstall process, before files are extracted, during component selection, or on post-install cleanup.
Key Features
- It is available for Windows as a misc-category utility from Jrsoftware.
- Directly distributed by Jrsoftware with full source code on GitHub.
- Version 6.7.2 is downloadable and is free of charge.
Common scenarios: a single developer distributes a desktop app and includes the whole program tree, plus registry keys and Start Menu shortcuts in a single redistributable EXE; a build pipeline at a software studio runs the Inno Setup command-line compiler (ISCC) silently to create signed, encrypted installers on every CI commit; an IT team scripting a departmental software rollout uses silent-install flags and Pascal conditional logic to install different program trees to different machine types.
Covering x64, ARM64 and Itanium architectures from a single script file means modern hardware without having to maintain separate build configs. Inno Setup’s declarative section syntax ( [Files], [Registry], [Icons] ) allows to keep scripts readable and auditable, while maintaining runtime flexibility, where NSIS needs more verbose scripting to do the same tasks on the registry and shortcuts.
