HiThomas Köller 

In case your computer crashed, or you can no longer access Trados from your old computer, please reset your license from your RWS account – Products&Plans - Licenses&Subscriptions as indicated in the article below:

perpetual license reset KB article

What Windows do you have? The activation can be done either online or offline, but if you have Windows 11 try the following steps: 

In Windows search bar type "Device Manager" and open it and then go to: Network Adapters - Action - Add Legacy Hardware - Install the hardware that I manually select from a list - Network adapters - Choose a network adapter (Microsoft > Microsoft KM -Test).

Then try offline activation: https://gateway.rws.com/csm?id=kb_article_view&sysparm_article=KB0039784.

If you encounter any issues, please let me know.

Kind  regards,