I don't know where and how you got the 1.9 version, but the only one that I've found is GALILEOS Viewer version 1.8. I've initialized the installation process and it worked out of the box without issues or other errors.
Re-download the 1.8 version and then right click the setup.exe file and choose Run as Administrator because that's what I did on Windows 10 and it worked without issues.
Also, while you're at it, install latest version of Net Framework and Visual Runtime C++.