Access Denied during upgrade

[Jeff Evans]

I'm trying to upgrade from ProGet 4.7.6 to 4.7.11, but the installer fails with "Access to the path 'C:\Program Files\ProGet\WebApp' is denied". I've tried running the downloaded installer as administrator, but it didn't help. Is there a workaround?

from the log:
Information: Removing previous version...
Debug: Staging C:\Program Files\ProGet\Service for delete...
Debug: Attempting to rename C:\Program Files\ProGet\Service to C:\Program Files\ProGet\e812ee0e2eeb46a6ac958621aa70b609...
Debug: Attempting to rename C:\Program Files\ProGet\Service to C:\Program Files\ProGet\e812ee0e2eeb46a6ac958621aa70b609...
Debug: Attempt 1 failed: System.IO.IOException: Access to the path 'C:\Program Files\ProGet\Service' is denied.
at System.IO.DirectoryInfo.MoveTo(String destDirName)
at Inedo.Installer.Subtasks.DeleteDirectorySubtask.<>c__DisplayClass9_1.<StageDelete>b__0()
at Inedo.Installer.Subtasks.InstallationSubtask.Retry(Action action, Int32 attempts, Int32 delay)

Product: ProGet
Version: 4.7.6

[Alana]

Assuming that the service is actually shut down, this means that another process is locking a file in this folder. Maybe it's an open window, or a command prompt, or something. In this case, rebooting will release those locks probably.

[Jeff Evans]

We had switched to IIS hosting of the web site, and so the solution was to first stop the web site in IIS Manager before running the installer.