Don`t start in UE 4.26.2

[lycifer3]

This plugin don`t work in UE 4.26.2.
Missing modules error

The following modules are missing with a different engine version

MirrorAnimationSystem
MirrorAnimationSystemDev
MirrorAnimationSystemEditor

Engine modules cannot be compiled at runtime. Please build throught your IDE

I don`t know how rebuild this plugin.

[marcthenarc]

It means you need to compile it with a C++ compiler so that the plugin becomes compatible with your engine version. You probably have a Blueprint only project. You can add C++ functionality by simply adding a compiler on your system (on Windows, it can be Visual Studio Community Edition - https://docs.unrealengine.com/4.27/en-US/ProductionPipelines/DevelopmentSetup/VisualStudioSetup/), create a bogus C++ class from Unreal Engine to setup the project (under File > New C++ Class > MyClass.cpp) then add this plugin under the Plugins folder of your project and build again. Your compiler will build the missing modules. You can still use blueprints after that of course; it's just the plugin that's compiled.