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This error on upgrade can be caused by the removal of the InstallShield directory which stores the data about previous installations (by default, C:\Program Files (x86)\InstallShield Installation Information), or the SEG specific subdirectory in this directory.
"System cleanup" applications might remove this directory or you might have removed it by mistake.
Run the installer for the exact version of SEG that is already installed (such as 8.0.4.10434), and "install" it with the same options and modules. This process will re-create the uninstall information. After completing this process, you will be able to upgrade.
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