Run the tool, select your USB drive, and click "Build." This processes the files so the cabinet can read them. : Plug the USB into your Legends cabinet. Go to the AppStoreX tab on your cabinet.
To download and install the (likely referring to the LEGENDZ GRANDS-X skin for the AtGames Legends Ultimate family of devices), you typically need to access the community-maintained resources on Archive.org or the Fans of SAUCE community. Preparation Checklist Download LEGENDZ GRANDSIX zip
Download the official from their website. Run the tool, select your USB drive, and click "Build