Basic MSI project, has been through several releases. We always do minor upgrades - keep productcode the same and change packagecode. I just installed the latest release on one of our test machines (worked fine). Someone else then re-ran the installation. Normally this just goes into modify/repair mode. This time it says 'another version of this product is already installed'. We use the InstallShield option to build a setup.exe. Looking at the MSI log, I can see that setup.exe is not specifying reinstallmode when it launches msiexec - setup.exe thinks it is a new installation.
Any ideas why? I can't see any way to turn on any logging in setup.exe itself.
