I recently upgraded from version 13 to the latest. The last release I did of my product seems to have some strange issues when upgrading my product. When you install and it goes through the upgrade it appears to be fine but my application does not run (IIS app and generates 500 error about missing MVC files). When they launch my setup project and choose REPAIR then my product seems to work just fine.
I checked some DLL files and they seem to be replaced with the latest DLL files so I am really not sure what is going on with the upgrade process and Advanced Installer.
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