Nov 29, 2017.My co-worker and I encountered the same thing on our 2018 MacBook Pro (13-inch, Four Thunderbolt 3 Ports) computers. I found that I needed to restart my computer in Safe Mode (hold Shift key during restart) and then I was able to complete the download and install of Catalina. My coworker's solution: It turns out that having Cisco AnyConnect installed on the computer interferes with ..