Thank you for your solution but, which one ?
The solution certainly depends on whether you own the required license or not.
If you own the required license
If your license is stored on an USB-eLicenser, please refer to this article: USB-eLicenser is not recognized, license mssing
If your license is stored on hard disk, please refer to this article: Soft-eLicenser help/FAQ
If you have a still unused Activation Code, please follow the instructions given here: Software/license activation (how to use activation codes).
If you have a license, but you need a new Activation Code since you’ve switched to a different computer, please have a look here: Software/license reactivation (requesting new activation codes)