(2018), there is no official "patch" or feature that allows you to unlock all items purely while playing offline, as progression is strictly tied to the game's online servers. However, several community-driven workarounds and official mechanics exist to bridge this gap:
The patches referred to in the query function by intercepting and modifying the game's local memory or configuration files to simulate a "fully unlocked" profile. hitman 2 offline unlock everything patched
Some users share save files that have already reached 100% completion while online, which can then be used in offline mode to access the equipment. (2018), there is no official "patch" or feature