• Download the latest version here
• Make a complete backup of your current WebDisk folder
• Verify that the backup is complete and contains your web.xml
• Stop Tomcat
• Rename your current WebDisk folder or move it into another folder
• Extract the new version to your WebDisk folder.
• Make your changes to the new web_default.xml
• Rename the new web_default.xml to web.xml and make sure that it has the same location that your old web.xml had.
• Start Tomcat

Note: It is always recommended to use the new web_default.xml instead of your old web.xml. Oftentimes there are new parameters which must be declared in web.xml and may not be missing.