You can use third-party enterprise app certificates to install the game directly from Safari.
For peace of mind, create a secondary, blank Apple ID purely for sideloading purposes rather than using your primary iCloud account. Ark Mobile Ipa
These are modified versions of the official app that attempt to bypass the in-app purchase checks to unlock the "God Console" or expansions (like The Island or Ragnarok) without paying. You can use third-party enterprise app certificates to
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