If the license has expired (and is not renewed automatically), you can extend the license in the following ways:
The trainee starts in a new program
If the trainee is (re)invited to a program, the default license type of this program will be assigned.
The admin manually renews the license
As an admin, you can manually renew the license per trainee. Go to trainees. Select the trainee whose license you want to renew by selecting the checkbox. Then click renew license. You can now select the desired license type for the trainee.