Can I use the API of Trados Studio Freelance from a standalone application?

Hi,

We are creating file-based projects through the desktop API of trados studio. 

A client has a freelance version of Trados Studio and they get a "A valid full Trados Studio license is required to use the project automation API in a sandalone application".

I have some slight memories from the past that the desktop API in a standalone application requires Professional license, but I cannot find this written anywhere now.

Can you please help?

Thank you,

Tamas