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

Key Feature:

• Support for all versions of Windows in use today: Vista, XP, 2008, 2003, 2000, Me, 98, 95 and NT 4.0. (Service packs are not required.)
• Extended support for installing 64-bit applications on 64-bit versions of Windows. x64 and Itanium architectures are supported. (In Itanium architecture, 64-bit installation on Windows Server 2003 requires Service Pack 1 or later.)
• Supports the creation of a single EXE file to install your program for easy online distribution. Disk partitioning is also supported.
• Standard wizard interface in Windows 2000/XP style.
• Custom installation types, such as full, minimal, custom.
• Full removal options.
• File Installation: Includes built-in support for ‘deflate’, bzip2 and 7-Zip LZMA file compression. The installer has the ability to compare file version information, replace used files, use a total file count, register DLL/OCX and type libraries, and install fonts.
• Create shortcuts anywhere, including the start menu and desktop.
• Create registry and .INI entries.
• Built-in Pascal scripting engine.
• Support for multilingual installation.
• Support for passwords and encrypted settings.
• Silent installation and removal.
• Full source code available (Borland Delphi 2.0-5.0).