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15.3.2 upgrade failure

Attempted upgrade from 15.3.1 to 15.3.2 on four of our twelve hosts. Identical problem on all of them so far - Serv-U.dll. "An error occurred while trying to replace the existing file: DeleteFile failed; code 5. Access is denied.

Have tried waiting & click "retry". Not happening.  Went in & made sure service is stopped.  Tried shutting down Serv-U first & exiting tray before attempting upgrade.  These are very standard host servers, doing nothing other than hosting Serv-U.  Are there any other customers running Serv-U host on Windows that have successfully upgraded to this version?