Apparently, OrCAD standard also contains the file necessary. It is indeed the extracta.exe, has to be given to windows path, run a batch file winch comes with altium, and it converts .brd to .alg. And that can be actually imported. Although Altium needs a restart after import, because it doesnt work properly afterwards (typical).
My only problem is that they have a import wizzard, which even tells that it can import .brd. And then it doesnt in fact you need todo a bunch of manual work to import. Annoying if you have a few dozen project. Anyway, problem is solved now, thanks for the help.