INNO Setup is a free installer for Windows programs available at JRSoftware. There is no official unpacker – the only method of getting the files out of the self-extracting executable is to run it. An open source utility called innounp.exe is maintained at Sourceforge. Sourceforge has maintained version 0.19 online for over a year, however, 0.20 also exists from Sourceforge, if you know the link. With the introduction of INNO Setup version 5.2.3, the existing versions of innounp have proven to be unsucessful. I recently discovered that another versioin of innounp.exe exists and is maintained by ..:: LeecherMods ::.. .
This is a list of files available with the version 0.23 download. innounp.exe is in Chinese, however, does work in the English environment just fine.
I was unable to get this innounp.exe to work with Universal Extractor 1.6, however, did work with InnounW.exe a GUI written in English.
In this example, I decompressed UltraISO 9. Below is a folder structure of the contents.
This is the contents of the .iss file.