In general, you mark the return value from the CA as "check" so that
the install will not continue. Your code can call Win32
MsiProcessMessage to display an explicit error if required.
However that error result is 259. That is the standard "error" result
back from APIs that enumerate items, and it
Hello I have a problem with a Installation that do deinstall a old version
of the programm and install the new one.
The old installation checks if Internet Explorer is opened and show a
Dialog to close it.
If you select Yes, the Internet Explorer is closed and the old installation
will be uninstal
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