Install problem

attempting to install update 5.2.3 on a WIN 10 computer. I keep receiving a notice: FILE IN USE SOME FILES THAT NEED TO BE UPDATED ARE CURRENTLY IN USE WINDOWS EXPLORER PROCESS ID: 4832. I checked Task Manager and Windows Explorer does not appear.

In Task Manager click on the details tab. You can sort the open processes by ID and find the offender. You could also try the old standby of shutting things down and re starting.