Back in early May, Damain, newbie, 3 posts, announced that there was a malware problem with the simulator downloads.
I looked into it, made enquiries, waited to see what developments arose.
Of several possible explanations, it seems that maybe an .exe being inside a .zip was giving rise to a false positive. I have read many places that Windows Defender is next to useless. I also haven't looked with great care... which is what you need to do in this wicked world, at the download link cited by Damain.
Today, I went to my own page about the simulator...
https://www.sites.google.com/site/unoardusim/services
Used the "Catch your simulator... Go to..." link there, and a little RTMing... the download may not, today, be EXACTLY what is was when I wrote my page... fetched the zip for version 1.5, and on a Windows 7 (until MS highjacks it, with THEIR malware) did a malware scan of it with Eset's Intnernet Security, which I have been happy with for some time. No issues reported.
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Off topic rant- Windows.... I've heard it said that the little red "x" in the upper right corner of the "Do you want to upgrade to Wondows 10"- type windows that are plaguing the planet has been reprogrammed to mean "Yes! Update me!" (You know the window... the one that doesn't have a "no, go away, don't ask again" button.)
One of my systems took 20 hours to download the massive monstrosity that clutters my soon-to-be-Linux desktop PC, VDU monitor, with all sorts of stuff only appropriate to a internet enabled smartpone with a touchscreen. Bah!