No system files or preferences are modified, only graphics. However, there is an option in the Installer to return to Apple's own design. The installation is still at your own risk, so you should have a time machine backup ready.
First app of its kind. Automatically checking whether the Download meets your system reqirements. Using theoriginal Apple installer with uninstaller option (original graphics) included. This is why the file size is quite heavy. Others try to do this manually.
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