"Source file corrupted: SHA-1 hash mismatch" error from Inno Setup

Question

While installing an application on Windows 2008, I get the below problem in the middle of installation:

Source file corrupted: SHA-1 hash mismatch.

Here's the section of the log file.

2013-01-28 21:55:36.945   Installing the file.
2013-01-28 21:55:37.397   Source file corrupted: SHA-1 hash mismatch.
2013-01-28 21:55:37.881   Defaulting to Abort for suppressed message box 
                          (Abort/Retry/Ignore):
                          C:\Program Files (x86)\XYZ\XY.exe
                          
                          An error occurred while trying to copy a file:
                          The source file is corrupted.
                          
                          Click Retry to try again, Ignore to skip this 
                          file (not recommended), or Abort to cancel 
                           installation.
2013-01-28 21:55:37.881   User canceled the installation process.
2013-01-28 21:55:37.881   Rolling back changes.

Can someone help to resolve the issue?

The installer as produced by Inno Setup compiler is valid and working. The corruption happened somewhere else.

Thanks in advance.

Answer 1

As the error indicates, the installer has been corrupted somehow. This is most likely due to a bad download. Have the user download the installer again. (Note however that the problem may still happen, either due to a repeat of whatever caused the original download failure, or due to something caching the bad file.)