If there is no license issue involved, this problem could have many causes. Mainly, it could be indeed due to the complexity of the model. It is not impossible for a simulation to use more RAM than 48GB. You can take steps to simplify this. First, I would advise you to check the HPC settings (tools > options > HPC and analysis options) and adjust them according to your computer's capabilities. If parametric simulation is used, I would advise you not to run the parametric simulations in parallel, as it takes up more RAM. Finally, if the mesh is too "heavy", assigning mesh operations would help to keep the mesh dense on the parts of the model that need accuracy and make the mesh coarse (and therefore "lighter" for the simulation) on the rest of the model.
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