I have several cases where users are not able to install my app built with ISX 3.51. They get the following error:
"The installation package cannot be installed by the Windows Installer service. You must install a Windows service pack that contains a newer version of the Windows Installer service."
If I have users on Win9x systems manually run instmsia.exe and then run the installation again it works fine.
Can I add the execution of instmsia.exe as a custom action at the start of the installation to avoid this problem? Is so, at what stage should this be done.
Also - can I set it up to run instmsiw.exe if the target system is Win2000/NT and if so, how?