While I am somewhat sure that it is a false positive, it is still suspicious and strange:
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I do not say it has or has not some kind of malware! Decide for yourself or wait for a someone with knowledge to report or a fix!)
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Virustotal online scanner reports a trojan, a common one that is often a false positive, but still. My local scanners (which are also listed on Virustotal) don't report anything.
Extracted folder is set to hidden, this is not really a problem.
The extracted folder is 750 MB big, while the download is like 71MB. The assets are multiple big files(which makes uploading it to Virustotal hard), guess this is a Unity configuration thing?