Hey, opened a new account and tried several times to enter the license key. getting always the message that the key is invalid. don’t know what to do
thanks.
Mmm 
I think you’ve tried using Rhino with a new Evaluation license, anyway Mcneal has changed its way and So you can’t add another Evaluation license again
but this is the very first evaluation key i’ve tried to install. 
then mmm Wait for Mcneal Guys to help u
Are you sure this is the first time you’ve tried to install a demo version? If so, for licensing issues it’s best to contact them directly at sales@mcneel.com.
Hi Kristina -
You downloaded an evaluation version of Rhino 7 for the first time on March 4th. You are only allowed a single 90-days evaluation period, after which you’ll need to purchase a license if you want to continue using Rhino. Note that if you are a student, you qualify for a 80% discount and can use the license after you are done studying.
For more information about which eMail addresses you have used previously, please contact sales@mcneel.com.
-wim
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Laier 