Inno Setup 6.5.4 – free installer for Windows apps

Inno Setup is a free installer for Windows programs. First introduced in 1997, Inno Setup today rivals and even surpasses many commercial installers in feature set and stability.

Features include a wizard interface, creation of a single EXE for easy online distribution. It supports the disk spanning, full uninstall capabilities, customizable setup types, integrated file compression. Also includes support for installing shared files and OCX’s, and creation of Start Menu icons, INI entries, and registry entries.

This program places no arbitrary limits on how many files, shortcuts, registry entries, etc. that you may include in an installation. However, keep in mind that Inno Setup does need memory for each entry in a script. For example, roughly 120 bytes of memory is needed for each [Files] entry.

Inno Setup Key features:

• Extensive support for installation of 64-bit applications on the 64-bit editions of Windows. The x64, ARM64 and Itanium architectures are all supported.
• Extensive support for both administrative and non administrative installations.
• Supports creation of a single EXE to install your program for easy online distribution. Also supports the Disk spanning.
• Standard Windows wizard interface.
• 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, and install fonts.
• Creation of shortcuts anywhere, including in the Start Menu and on the desktop.
• Creation of registry and .INI entries.
• Support for multilingual installs, including right-to-left language support.
• Running other programs before, during or after install.
• Support for passworded and encrypted installs.
• Support for digitally signed installs and uninstalls, including dual signing (SHA1 & SHA256).
• Silent install and 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 about 1.3 mB overhead with all features included.
• All features are fully documented.
• Used by Microsoft Visual Studio Code and Embarcardero Delphi.

The Inno Setup QuickStart Pack includes Inno Setup itself and additionally includes options to install third-party add-ons such as the ISTool script editor and Inno Setup Preprocessor. These add-ons are not official and are not required for general usage, but make Inno Setup easier to use.

Changes in Inno Setup 6.5.4 (2025-09-24):

• Fix: Pascal Scripting: Using event function CurInstallProgressChanged would result in runtime errors.

Changes in Inno Setup 6.5.3 (2025-09-11):

• Fix: Compiler IDE: The New Script Wizard would generate [Files] section entries with random values for the ExternalSize parameter.

Changes in Inno Setup 6.5.2 (2025-09-10):

Improved graphics

It’s now possible to use .png files in Setup and Uninstall, and use of transparency has been increased.

• Added support for .png files to [Setup] section directives WizardImageFile and WizardSmallImageFile.
• Improved support for stretching 32-bit .bmp files with transparency.
• The built-in wizard images and icons now have transparent backgrounds, allowing their background colors to be customized again using Setup section directives WizardImageBackColor and WizardSmallImageBackColor, which are no longer obsolete.
  The default values of these directives match previously used colors, so the appearance of all images and icons remains unchanged by default.
• Pascal Scripting:
  • Added new TPngImage support class.
  • Added new PngImage property to support classes TBitmapButton and TBitmapImage.

Removed main size limits

The size limit of 2 GB for a single Setup.exe and for disk slices has been removed.

• The maximum size for a single Setup.exe without disk spanning has increased from almost 2 GB to nearly 4 GB, which is near the maximum Windows supports.
  However, disk spanning is still recommended for large executables due to slow startup times imposed by Windows, especially when the executables are digitally signed.
• With disk spanning enabled, the maximum disk slice size has been increased from almost 2 GB to effectively unlimited (9223 PB).
  The default disk slice size is still 2100000000, which is almost 2 GB. To update, you can simply set [Setup] section directive DiskSliceSize to max.

Improved downloading and archive extraction

• All download functionality now supports TLS 1.3 when available. Support for TLS 1.0 and 1.1 has been removed on all versions of Windows.
• Archive extraction now supports the RAR5 format. Requires Setup section directive ArchiveExtraction to be set to full.
• Compiler IDE: The New Script Wizard and the Generate [Files] Entries tool now support adding files to be downloaded. They will prompt you if the downloaded file is an archive that should be extracted.
• Fix: Using [Files] section flags download and extractarchive on an entry that also has a Tasks parameter now works as expected.

Other changes

• Compiler IDE:
  • Added new Automatically reload files and Allow Undo after reload options. Both are enabled by default, consistent with most other modern editors, and improving integration with tools like Claude Code.
  • Added dark mode support for command line options /cc and /wizard.
• Pascal Scripting: Added new HighContrastActive and LogFmt support functions.
• Minor tweaks and fixes.

Homepage – https://www.jrsoftware.org

Supported Operating Systems:

• Windows 7, 8, 8.1, 10, 10 on ARM, 11, 11 on ARM
• Windows Server 2008 R2, 2012, 2016, 2019

Size: 7.41 MB

DOWNLOAD Inno Setup Stable

DOWNLOAD QuickStart Pack