While Tutorial Master supports plugins like PlayMaker and TextMesh Pro, they're stored as .unitypackages and must be imported first. Ideally, it's recommended importing third-party scripts after the plugin itself has been imported into your Unity project.

To import a package, go to Window > Tutorial Master > Import Third-Party and select the plugin you prefer.

Exported plugin scripts can be found inside of Tutorial Master/Third-Party/Active/ directory, organized into folders.

If you're not planning on using any third-party plugins, feel free to delete the whole of “Third-Party” folder to save space. However, you would need to reimport Tutorial Master to recover deleted files in order to be able to access the menu Third-Party menu.