Looks like you are not running the setup in Admin mode.
Also, the source installation file can be corrupt. Try re-downloading the setup from FileHippo: Download Orbit Downloader 4.1.2 - FileHippo.com
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Marty: Hey, Doc, we better back up. We don't have enough road to get up to 88.
Doc Brown: Roads? Where we're going, we don't need, "roads!" :)
──── On the Internet you can be Anything you want. It's Strange that, so many people choose to be Stupid! ────