Maison

They couldn’t help. What´s my next step??

Thanks Kharis!
Yes, plugins were activated and updated.
However, it appeared that block came from those plugins:
resmusit, WordFence, Sucuri, Astra Starter Templates and some others that have been installed by the server.
It is dowloadable now but looks different:
see http://www.nkt.ee

All the best,
Tuuli