WOW 20hrs and no one can assist
This is a User to User forum, which means that unusual issues can go unattended to for some time.
I don't use Windows, but the description you've provided suggests that something is blocking the installation of some components. Do you have a virus checker or firewall running? If yes can you temporarily disable same then check if installation completes. If this this resolves the installation problem I suggest you add Lightroom CC to the list of safe applications.