Thanks guys, but I am not where I wanted to be yet.
First it turned out that, because I have a Norwegian bought iMac, Apple had swapped the word Library in the directory tree with the Norwegian word for it (Bibliotek). So far so good. The OS apparently reads Library and Bibliotek as the same word. Don´t ask me why and how. everything else is in english ...
I found the directories you list Arnt, but then I got a new problem.
I imported an ICC profile from Canson, for their Baryta photographique paper. I opened it and it looked good to me. I then tried to save it in both the specified .../Profiles directories. But then I´m told that the file cannot be saved as CIFA_pixmapro1_baryta310.icc. I have tried other names, but ends up with the same message.

What am I doing wrong here???