Little-known anti-malware programs display warnings, which are often identified as false positive. Nevertheless, it is recommended to recheck the file with your antivirus software after downloading.
We do not have a download file for the latest version (4.0), but you can try downloading it from the developer's site
Download version 0.9 from Mac Informer
Version: 0.9
Date update: Jul 14, 2016
File name: nfsu2_demo.exe
Size: 345 MB