CA WA Agent 11.4 fails to upgrade on Windows

Document ID : KB000118031
Last Modified Date : 23/10/2018
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When upgrading the CA WA Agent on Windows, the installer returns this error message:
Error! Upgrade backup failed;
Problem deleting file - jars/librariy.jar
Windows OS: Any
CA WA Agent 11.4
The error is due to inadequate permissions.
When upgrading the CA WA Agent make sure:
1.  The Agent has stopped
2.  Run the CA WA Agent setup.exe as administrator.  Right click on setup.exe and click on "Run As Administrator"