AutoSPInstaller error – Failed to download WCF Data Services 5.6 installation package

I have downloaded SharePoint 2013 SP1 (Service Pack 1) to be installed offline with AutoSPInstaller 3.96.  However, the prerequisites installer fails with the following error:

WARNING: 2014-04-21 09:15:29 – Error: InternetOpenUrl failed (0X80072EE7=-2147012889)
WARNING: 2014-04-21 09:15:29 – Error: Failed to download WCF Data Services 5.6 installation package, (0)
WARNING: 2014-04-21 09:15:29 – Last return code (-1)

This, it seems, is because SharePoint 2013 Service Pack 1 requires a newer version of the WCF Data Services.  The existing wcfdataservices.exe is version 5.0 so I have now added version 5.6 to the prerequisiteinstallerfiles folder.  As the two files have the same name I have renamed the new file to WcfDataServices56.exe

I have also modified the PrerequisiteInstaller.Arguments.txt file to include the new /WCFDataServices56 parameter:

/WCFDataServices56:”prerequisiteinstallerfiles\WcfDataServices56.exe”