I 'suspect' that the issue is that the x86 MSI package was built first and the x64 built later with a newer version number. So when you try to install the x86 over th x64 it is not allowing you to downgrade the package. My x86 and x64 packages are all exclusive of each other so I have not dealt with this situation. But I expect that you might want to look at MajorUpgrade/@AllowDowngrades
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