To use amondo patch quicken, first, you need to download the appropriate Mondo Patch update from the official Quicken website, matching your Quicken version. Then, close Quicken and run the downloaded Mondo Patch file. It will automatically update your Quicken to the latest version. Restarting Quicken after the installation completes the process. Remember, using a Mondo Patch is recommended when regular updates fail or when specific errors persist in your Quicken software.