Instead of using unverified files, you should use the official, secure versions of the Longman Dictionary available on major app stores.
The string you're referring to, download-ldoce-plus-v13-univ-64bit-os90-ok14-user-hidden-bfi2-ipa , appears to be a specific filename or search query for a pirated or "cracked" version of the application for iOS. Instead of using unverified files, you should use
: You can find the Longman Dictionary of English on Google Play , which supports offline use. Instead of using unverified files
: Files labeled "hidden" or hosted on third-party file-sharing sites often contain malware or trackers that can compromise your device. you should use the official