I'm trying to install Lightroom together with Adobe Creative cloud. Well... the procedure arrives at 40.1% and then... nothing. If I stop it and then I open the Creative Cloud to re-start the installation in the "App" section I can't do nothing cause "I'm not the administrator". For sure that's not possibile as you can imagine. I tried to unistall the package and to re-start the procedure but I obtained the same result (also with the Antivirus disable).
Make sure that you have all Windows updates that are available.
The one thing that was causing it for me, believe it or not, was that I needed to do a clean installation of the latest Studio graphics driver from the NVIDIA website. After doing that and restarting, all was OK.