OS 10.13.2 install freeze

I have downloaded the update 3 times from the App Store. After downloading the computer restarts with a bar and a message that 1 minute remains, the screen goes black after a few seconds, and then the apple logo appears, and nothing happens except the Mini becomes very warm. I have let it sit for over an hour. If I reboot, I just get the logo and freeze again. The Mini has two internal drives, both of which are solid state. On one drive I have Bootcamp formatted with Windows 7 - in case that has anything to do with it.