The Analytica Free 101 edition lets you create and edit models with up to 101 variables and other user-defined objects (model, modules, functions, and so on). For larger models, it keeps you in Browse mode: You can view the model, change inputs, and calculate results. But, you can't change the model or save it. These messages are just letting you know that.
If you want to edit this model, or other models with more than 101 user objects, you need to purchase a copy of Analytica Professional, Enterprise, or Optimizer edition. You can do this at purchase Analytica Professional. (That way you can also support Lumina in developing Analytica.)