Hi Andrew,
In the "Files and Folders" page select the file you want to force the overwrite and choose properties from the context menu. In the "Version" tab of the "Edit File" dialog set the "Overwrite with this" option to "65535.65535.65535.65535" value.
This represents the version column from "File" table and it's compared with the real file version at install time.
You need to do this for each file you want to force the overwrite.
Regards,
Gigi
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Gheorghe Rada
Advanced Installer Team
http://www.advancedinstaller.com