Have you read this full thread which details all the changes made in DSM 7 plus includes the migration instructions ( How-To do what the installer is telling you to do ) ?
If you are using DSM 7, when you uninstall,
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It will ask if you wish to uninstall the package – You continue
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On the next page, you will be presented with options about how to Uninstall.
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Do you see this? This is the “Erase” option I am referring to. It removes the installed DSM 7 installation . It does not remove any DSM 6 files. We need those files.
If you do not. I MUST ASK – Are you using DSM 6 or DSM 7 ?