[Закрытые] I get "Import Error 504 Gateway Time-out The server didn't respond in time."

Hi, so I'm trying to import 259 articles, in 4 languages each, from скрытая ссылка to скрытая ссылка... to do it i'm using wp all import pro... that is the only way suggested by the WPML team. The export works find, but when I try to run the import when I get to 8% - 21 articles, i get "Import Error 504 Gateway Time-out The server didn't respond in time." Even if I then try to resume the import it won't go on.

I already tried to give more time before timeout, and followed all the suggestions in the wp all import documentation. I also contacted them and they said basically they can't give support for multilanguage imports. Isn't there another way I can do this thing? is not possible is such a complicated task...