The v1681914 crack works by emulating a local server. It tricks your PC into thinking it is talking to Battle.net. Here is what a v1681914 crack must do:
Unlike the original Diablo II (which had a simple CD-key check), Resurrected uses a hybrid system. Even when you select "Offline Mode," the game client must ping Blizzard’s servers to verify your ownership—usually once every 30 days.
Officially, Diablo II: Resurrected is available for purchase on various digital storefronts, such as Battle.net, Steam, and the Epic Games Store. If you're looking to download the game for free, I must advise that pirated or cracked versions may not be safe, as they can contain malware or other malicious code.