It works now.
Just to tell you why - I had a old mail adress in my profile, I think It was for testing reason years ago.
So, when I bought license yesterday, I did not see this :-).
So, I had to change only adress in profile > now, importing works fine :-)
Problem > In the backend, I gave my new adress and licenskey, it said, its activated. Should not, my opinion. Because the combination should have been the old mail addy and the license key - so I could not see any error. In your backand of profile, it told me actived. I hope you understand my text. Maybe should change something to make sure.
Have a nice day.