The steps and commands for upgrading the instrumentation are exactly the same as for installation. If you are using the wrapper script, then a new version is only pulled down if necessary (in case the installed instrumentation is older than the latest available).
When the APM Integrated Experience is enabled, AppOptics shares a common navigation and enhanced feature set with the other integrated experiences' products. How you navigate AppOptics and access its features may vary from these instructions. For more information, go to the APM Integrated Experience documentation.