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
Extract the contents (usually folders named addonx and cox ) directly to the of your USB drive. Do not put them inside another folder. Run the AddOnX Tool : Download LEGENDZ GRANDSIX zip
: Ensure your cabinet is updated to the latest firmware. Note that firmware 5.70+ introduced some security changes; if you have issues, check the AtGames Support Page . To download and install the (likely referring to