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Activating NMT in SDL Trados Studio 2019: "Your subscription has expired"

I tried to activate NMT in SDL Trados Studio Freelance (SR2 15.2.4.1693) following these instructions:

www.sdl.com/.../nmt-for-Studio.html

After selecting Use->SDL Language Cloud..., I got a message "Your subscription has expired".

Please advise how I can get access to SDL NMT?