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Tutorial: Character Editing Cavats; Step 3.
Generate a Mirror Table in Unreal Engine
Launch Unreal Engine 4.18.3 and create a new blank project. Remember the folder location that you entered where the project will be stored. In my case, it's located at X:\BloodstainedMods\CharacterEditing\CharacterEditUnreal.
After the project is created an Unreal Engine loads, immediately close Unreal Engine. Navigate to the folder where the project is stored. It should have “Config”, “Content”, “Intermediate”, etc. folders inside of it already. Create a new folder in this directory and name it Plugins.
Download the Mirror Plugin Toolbar tool and extract the contents of the .zip file. Copy the “MirrorPluginToolbar” folder and paste it inside of the Plugins folder you just created.
Now if you open the MirrorPluginToolbar folder you just pasted inside of the Plugins folder, it should contain a file called MirrorPluginToolbar.uplugin. If it does not, you did something wrong. Make sure the folder structure matches the screenshot below.
Open up Unreal Engine again, and load the project you just created.