Summary:
I’m applying a patch (myapp.msp) to an application.
The patch works correctly if I right click on the msp file and select “apply.”
However, when invoked programmatically, with elevated privileges, the UI
reports success but no files are updated. To make matters worse, the
application version number in control panel/installed programs is updated to
the “new” version.
Detail:
Both the patch and the application were created with InstalledShiled
Developer 8.0.
I’m applying the patch in 3 different ways:
1. Right click patch file and select “Apply”
2. With a batch file, invoked “as administrator”, containing “msiexec –p
mypatch.msi”
3. From an application, with manifest that requires elevated privileges
From an end user point of view, all three methods result in invoking the
patch process, and after some crunching it reports success.
However, only #1 updates the application correctly.
#2 and #3 do not update any of the files, but they do update the application
version number as appears in Control Panel / Installed Programs.
Examining the log files for method #1 vs. method #2 shows only one
significant difference.
The “pass” case shows MsiNetAssemblySupport= 2.0.50727.88.
The “Fail” case shows MsiNetAssemblySupport= 2.0.50727.00.
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