I realized I have ordered Van Til's book "The Defense of the Faith", from the only place with one in digital format, and that I did not install Logos since last windows 7 installation.
To install Logos 6 is a pain. First, I had to find and download .Net Framework 4.6.1. which had to be an offline version or else the installation of the Framework won't work. Also, the Logos did not organize their site well. There is an ambiguity between what is Logos Core Engine and other Logos programs.
Download the software you need here (you must own a Logos 6 base package or the Core Engine):
LogosSetup.exe (For PC Users) 480.47 KB
LogosSetup.exe is supposedly the Core Engine. But had it installed successfully, I wouldn't have such issue. After .Net Framework 4.6.1 is installed, running LogosSetup.exe again only popped up some installation status, including DirectX detection to see if there's need of installing it, which in my case there is no need. But after all these pop ups, the installation also disappeared. Took me a while to figure out that in Windows 7, I could go check the installation logs of any setup program: (C:\Users\...\AppData\Local\Temp\Logos Log Files). Then I realized that it was trying to download the offline version of Logos core which is Logos-x64.msi @ https://downloads.logoscdn.com/LBS6/Installer/6.11.0.0041/Logos-x64.msi which is around 141MB. So I got the file manually and it installed well. Now I'm ready to sleep.