CU5 upgrade can’t continue because powershell has open files

Issue: While installing Exchange 2013 CU5 you receive the following error message: “Setup can’t continue with the upgrade because the powershell has open files.  Close the process, and then restart Setup.”

readiness-checks-powershell-open-files

Setup can’t continue with the upgrade because the powershell has open files.  Close the process, and then restart Setup.

Solution: I didn’t have powershell running, and could not easily locate the process and didn’t want to start killing processes so I rebooted the server and then re-tried setup and the powershell error did not show up again.  If you determine what process causes this, please post it in the comments.  In the meantime, a reboot is all that is required.

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