MixinBootstrap is a temporary way of booting Mixin in a MinecraftForge production environment.
This is an unofficial method of loading Mixin. Do not expect any support.
Mixin is available in Forge 1.15.2-31.2.44+ & 1.16.1-32.0.72+
Source
License
MixinBootstrap is licensed under the Apache 2.0 license.
Mixin is licensed under the MIT license.
You are allowed to include this mod in your modpack.