I just downloaded the latest version of Rhino 6, because I would like to upgrade from Rhino 5. I have a Rhino 5 license key. However, Rhino 6 asks for a license upon startup (starting with “RH60-…”) which I don’t have. Also my Rhino 5 license obviously doesn’t work.
There is an easy way to get a Rhino V6 license key - just buy a Rhino V7 license and with the V7 key you can get a free V6 “legacy” key. Contact sales@mcneel.com or your local reseller for details.