We have to follow below steps.

1. Stop ETLValidator server service

2. rename apache-tomcat(ETLValidator/server/apache-tomcat) directory to old

3. download tomcat 9.0.86 from https://archive.apache.org/dist/tomcat/tomcat-9/v9.0.86/bin/apache-tomcat-9.0.86-windows-x64.zip

4. extract to the ETLValidator server directory

5. get server.xml from the old tomcat conf directory overwrite in the new tomcat

6. rename file tomcat9.exe in bin directory to ETLValidatorserver.exe

7. copy quartz.properties from the old tomcat conf directory to the new tomcat conf directory

8.copy.war files from old tomcat webapps directory to new tomcat webapps directory

9. now start the server service and test