Hi Matteo,
You need to select the registration number via the Order History.
Then you can display all license file associated to a registration.
You can refer to the FAQs:
Licensing and Registration FAQ|NXP
Else there are some info on community:
How to rehost CodeWarrior suite license
Cannot Re-host a license - License Lists is empty (valid to generate a license file associated to a...
Now if you're using a classic tool, you could have some problem after rehost.
In this case, to avoid problem we can re-encrypt the license.
Have a great day,
Pascal
NXP Technical Support
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