AirDrop or copy the IPA file to your iPhone/iPad.
Note: Sideloaded apps must be refreshed every 7 days unless you have a paid Apple Developer account. Adding ROMs to MAME4iOS Mame4ios Ipa
To avoid malware and outdated builds, always download the MAME4iOS IPA from reputable development hubs: AirDrop or copy the IPA file to your iPhone/iPad
Drop the zipped game files directly into this folder. then connect your iPhone via USB.
Download and set up AltStore on your PC or Mac, then connect your iPhone via USB.