By signing to this tool you will have a free apple developer account(related to your iCloud username and Password ), by using it you can sideload 10 apps, but you can activate only 3 apps. Apple changed something and it has broken sideloadly, a workaround is being worked on https://israelnwgov.shotblogs.com/top-ultime-cinque-sideloadly-notizie-urbano-29120039