Rhino 7 key pls

rhino 7 key need necessary
what can I do?

you need a Rhino 7 licence / installation ?
as far as I know:
you have to Buy Rhino 8 and then access rhino 7 here:

https://www.rhino3d.com/access-rhino-7/

This is not the place where you will find a free license key if that is what you were thinking…

Contact your local area reseller or the McNeel office for your region to buy a license.