Another way to install Skyline is with the "unplugged" installer:
https://skyline.ms/wiki/home/software/Skyline/page.view?name=install-64-disconnected_21_1
With the "unplugged" installer, you download a .zip file, and then extract all the files from that zip file, and run the "setup.exe" that you extracted.
Note, sometimes when you download a .zip file, before extracting files from it, it is necessary to right-click on it in Windows Explorer, choose "properties", and then check the checkbox that says "Unblock". Often, if you do not do that, Windows will prevent you from executing the "setup.exe" that you extracted from the .zip file.
-- Nick