Well, first check that the installer you downloaded did not get infected by a virus on your own machine: verify the sha1sum for CoolVLViewer-1.30.2.15-Windows-x86_64-Setup.zip with the one I give on the download page, then check the sha1sum for the unzipped installer, CoolVLViewer-1.30.2.15-Windows-x86_64-Setup.exe, which is 3ee4aa8375db696d75fb4fc4d2e3b4e1dd7c3ff5.
Then, to reassure yourself, upload the latter installer to
VirusTotal, and you will see the resulting
analysis by 68 antivirus suites and
3 different sandboxes (including MSE). As you can see, the Cool VL Viewer is totally void of any menace (amusingly, MSE reports network communications by the installer, while it never accesses any network resources, but if you look at the reported IPs, they are those of Windoze and Micro$oft, that is, the IPs used by MSE itself
) .
Antiviruses sometimes spew false positives, however it is pretty much impossible that the published viewer binaries get infected at my level: I am using a
dedicated VirtualBox VM (with most Windoze services shut down to minimize the attack surface) to compile them, and that VM runs under Linux, on a machine connected via Ethernet wires (no WiFi in my home !) to my local network, itself protected by a Linux firewall (*) between my ISP's Internet box (which I don't trust the least) and my network... I also always check my compiled binaries with ClamAV before packaging them, and I also often check the installer on VirusTotal as well... Of course, an infection on the host provider, while unlikely, is still possible, and should you have a virus on your own PC, it might infect the downloaded installer; this is why I provide the sha1sums...
It has been over 15 years I have been publishing hundreds (yep !) of viewer releases, and
never a single one conveyed a virus/trojan/malware/whatever...
(*) And I have been a UNIX/Linux admin for the past 34 years, so I do know how to protect a Linux computer from any threat.