If your intent was to "develop" or experiment with Fortnite's engine, you should use the official .
Many "cracked" installers are actually shells for keyloggers, ransomware, or trojans designed to steal your personal data. fortnite-crack-full-version-download
If you are on an iPhone or a device with restricted installs, you can play the full game for free via cloud services like Xbox Cloud Gaming or NVIDIA GeForce NOW. Risks of Using "Cracks" or Unofficial Downloads If your intent was to "develop" or experiment