BepInEx vs ModTek

BepInEx is a plugin and modding framework for Unity Mono and IL2CPP games, as well as .NET Framework games such as those built with XNA, FNA, and MonoGame. It provides configuration and logging, runtime method patching, and in-memory assembly patching. Runtime patching uses Harmony, including HarmonyX and MonoMod; in-memory patching uses Mono.Cecil with UnityDoorstop. The installation guide lists Windows, Linux, and macOS, though supported operating system versions and architectures depend on the build and game. Setup is manual: download the appropriate build and put its contents in the game’s root folder. Official binaries are available as stable and bleeding edge builds; the documentation recommends stable in most cases and notes that bleeding edge builds tend to be buggier. The project is open source under LGPL-2.1 and links to guides for users and developers. Compatibility has limits: stable releases are available only for Unity Mono, BepInEx 6 documentation remains a work in progress, and BepInEx 5 plugins do not yet work with the 6.0.0 pre-release.

ModTek is a free mod loader for HBS’s BattleTech PC game. It loads mods at game startup when they use the mod.json format, allowing modders to package self-contained changes without overwriting game files. It resolves dependencies and controls load order without requiring edits to VersionManifest.csv. The project says newer versions include DLC support not present in BattleTech’s built-in 1.7 loader. It supports BattleTech installations from Steam and GOG on Windows, Linux, and macOS. Installation uses a downloadable ZIP extracted into the game’s installation folder; the instructions warn that the game should be outside Program Files because Windows UAC protection can interfere. Version 3 and later use UnityDoorstop to load ModTek without modifying game files. The repository documents JSON and DLL mods, advanced JSON merging, manifest manipulation, and HarmonyX support. The project is licensed under LGPL-2.1. Linux instructions describe a system-wide ASLR change as an obsolete, insecure workaround and provide an environment-variable fix instead.