The only way to get a functional, legal license key is to purchase it through authorized channels. Official Rhino Store : You can buy directly from McNeel’s official website
Users can obtain a free 90-day license key for testing purposes. This is a full-featured version, but it is limited to one per person; once it expires, saving and plugins are disabled until a permanent key is purchased. Rhino 8 "Down-Grade" Path: Rhino 7 Licence Key
: This locks the license key to one specific motherboard. Use this only if you have no internet access. The only way to get a functional, legal