The model you just loaded uses functions that require a higher edition of Analytica. For example, if you are running Analytica Professional, but the model uses database access functions available only in Analytica Enterprise. Or if you're running Analytica Enterprise, but the model uses Optimizer features. You can still open and review the model, and evaluate variables that don't need those higher-level functions. But it will give an error if you try to evaluate a variable that does need such functions.
To make use of the full model, you'll need to upgrade to the higher edition -- which you can do at Buy Analytica.