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When the full installer is used to upgrade from 8.0.1 to 8.0.2 an uninstall of the previous 8.01 version is necessary. If you use the 8.0.1Patch1 file uninstalling will not be necessary.
The problem is most likely that you are attempting to use the full 8.0.2 installer. You only need to apply the patch for 8.0.1 that will bring you to 8.0.2. You can download the patch here:
Note: This patch can only be used when you already have 8.0.1 installed.