Even if files are readable, they can be blocked when accessed by other processes. To release all locks make sure to:
Close all ARIS command-line tools, such as ARIS Cloud Controller, ARIS server Administrator, ARIS document storage Command-Line Tool, or Process Governance Command-Line Tool.
Close all command prompt boxes that you use to start command-line tools, such as y-datadump.bat, y-elasticsearch.bat, y-ldapsync.bat, y-password.bat, or y-tenantmgmt.bat. Use the task manager or the process explorer to identify processes accessing the files.
Sign off all other users to release all possible file locks.
Reboot the machine to assure that no user has access to any file.