During these 90 days, you have access to all features, including saving and plugins.
Before downloading, ensure your Mac meets these minimum System Requirements : Rhino - Rhinoceros 3D Rhinoceros 7 for Mac Free Download
Once the 90-day period expires, saving and plugins will stop working unless you purchase a license key. However, it will still function as a viewer for Rhino and other file formats. During these 90 days, you have access to