Please help!!! is there any way to get opencore offline?

i have a serious issues with my internet connection so i'm looking for something offline, i'm not talking about gibMacOS full install, i'm taking about the official macOS .dmg file ( like this is a torrent file so i can pause and download any time https://filecr.com/macos/macos-big-sur/?id=182298982838 ) if anyone have the idea about this? i saw that it's download packages looks same so is gibMacOS download the same offlicial dmg or it download macOS with some patch pre applied? can i download official macos and place that folder into boot partition?

submitted by /u/Necessary-Guess2677
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