Hello Jari Jämsä,
I released a key slot in our system. Could you please try to activate the code again and let me know if the problem persists.
In case you are the person in your company who will use WebUI Tests Studio and will need technical support, my advice would be to ask Heikki Heikkinen to add you as a licensed developer under his account -> Your Products -> Licensed Developers. This way you will be able to submit support tickets through our system and take advantage of your paid support.
Let me know if I can assist you further.
the Telerik team
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