Inno Setup is an open-source installation builder for Windows applications by Jordan Russell and Martijn Laan. Since its introduction in 1997, Inno Setup has been trusted by developers and organizations of all sizes to reliably deploy software to millions of PCs worldwide.

Key features:

• Support for every Windows release since 2009, including: Windows 11, Windows 10, Windows 11 on Arm, Windows 10 on Arm, Windows Server 2019, Windows Server 2016, Windows 8.1, Windows 8, Windows Server 2012, Windows 7, and Windows Server 2008 R2. (No service packs are required.)
• Extensive support for installation of 64-bit applications on the 64-bit editions of Windows. The x64 and Arm64 architectures are both supported.
• Extensive support for both administrative and non administrative installations installations.
• Supports creation of a single EXE to install your program for easy online distribution. Disk spanning is also supported.
• Resizable standard Windows wizard interface, with support for dark mode and custom styles.
• Customizable setup types, e.g. Full, Minimal, Custom.
• Complete uninstall capabilities.
• Installation of files:

  Includes integrated support for "deflate", bzip2, and 7-Zip LZMA/LZMA2 file compression. The installer has the ability to compare file version info, replace in-use files, use shared file counting, register DLL/OCX's and type libraries, install fonts, download and verify files, and extract archives.

• Creation of shortcuts anywhere, including in the Start Menu and on the desktop.
• Creation of registry and .INI entries.
• Running other programs before, during or after install.
• Support for multilingual installs, including right-to-left language support.
• Support for password-protected and encrypted installs.
• Support for digitally signed installs and uninstalls.
• Silent install and silent uninstall.
• Unicode installs.
• Integrated preprocessor option for advanced compile-time customization.
• Integrated Pascal scripting engine option for advanced run-time install and uninstall customization.
• Full source code is available from GitHub.
• Tiny footprint: only 1.78 MB overhead with all features included.
• All features are fully documented.
• Used by Microsoft Visual Studio Code, Git for Windows, and Embarcadero Delphi.